{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,21]],"date-time":"2026-01-21T15:34:13Z","timestamp":1769009653910,"version":"3.49.0"},"reference-count":58,"publisher":"MDPI AG","issue":"23","license":[{"start":{"date-parts":[[2021,12,2]],"date-time":"2021-12-02T00:00:00Z","timestamp":1638403200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Distributed denial-of-service (DDoS) attacks are significant threats to the cyber world because of their potential to quickly bring down victims. Memcached vulnerabilities have been targeted by attackers using DDoS amplification attacks. GitHub and Arbor Networks were the victims of Memcached DDoS attacks with 1.3 Tbps and 1.8 Tbps attack strengths, respectively. The bandwidth amplification factor of nearly 50,000 makes Memcached the deadliest DDoS attack vector to date. In recent times, fellow researchers have made specific efforts to analyze and evaluate Memcached vulnerabilities; however, the solutions provided for security are based on best practices by users and service providers. This study is the first attempt at modifying the architecture of Memcached servers in the context of improving security against DDoS attacks. This study discusses the Memcached protocol, the vulnerabilities associated with it, the future challenges for different IoT applications associated with caches, and the solutions for detecting Memcached DDoS attacks. The proposed solution is a novel identification-pattern mechanism using a threshold scheme for detecting volume-based DDoS attacks. In the undertaken study, the solution acts as a pre-emptive measure for detecting DDoS attacks while maintaining low latency and high throughput.<\/jats:p>","DOI":"10.3390\/s21238071","type":"journal-article","created":{"date-parts":[[2021,12,6]],"date-time":"2021-12-06T03:10:38Z","timestamp":1638760238000},"page":"8071","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Memcached: An Experimental Study of DDoS Attacks for the Wellbeing of IoT Applications"],"prefix":"10.3390","volume":"21","author":[{"given":"Nivedita","family":"Mishra","sequence":"first","affiliation":[{"name":"Symbiosis Institute of Technology, Symbiosis International (Deemed) University, Pune 412115, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4507-1844","authenticated-orcid":false,"given":"Sharnil","family":"Pandya","sequence":"additional","affiliation":[{"name":"Symbiosis Institute of Technology, Symbiosis International (Deemed) University, Pune 412115, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8280-1140","authenticated-orcid":false,"given":"Chirag","family":"Patel","sequence":"additional","affiliation":[{"name":"Computer Science & Engineering, DEPSTAR, Anand 388421, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nagaraj","family":"Cholli","sequence":"additional","affiliation":[{"name":"Department of Information Science and Engineering, R. 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College of Engineering, Banglore 560059, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6462-059X","authenticated-orcid":false,"given":"Kirit","family":"Modi","sequence":"additional","affiliation":[{"name":"Sankalchand Patel College of Engineering, Sankalchand Patel University, Visnagar 384315, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Pooja","family":"Shah","sequence":"additional","affiliation":[{"name":"Information Technology Department, Gandhinagar Institute of Technology, Ahmedabad 382010, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3956-8686","authenticated-orcid":false,"given":"Madhuri","family":"Chopade","sequence":"additional","affiliation":[{"name":"Information Technology Department, Gandhinagar Institute of Technology, Ahmedabad 382010, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sudha","family":"Patel","sequence":"additional","affiliation":[{"name":"SALITR, SAL Campus, Ahmedabad 380060, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2653-3780","authenticated-orcid":false,"given":"Ketan","family":"Kotecha","sequence":"additional","affiliation":[{"name":"Symbiosis Centre for Applied Artificial Intelligence, Symbiosis International (Deemed) University, Pune 412115, India"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2021,12,2]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Huraj, L., \u0160imon, M., and Hor\u00e1k, T. (2020). Resistance of IoT sensors against DDOS attack in smart home environment. Sensors, 20.","DOI":"10.3390\/s20185298"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"1110","DOI":"10.1016\/j.procs.2020.04.119","article-title":"PhishPreventer: A secure authentication protocol for prevention of phishing attacks in mobile environment with formal verification","volume":"171","author":"Bojjagani","year":"2020","journal-title":"Procedia Comput. Sci."},{"key":"ref_3","first-page":"1117","article-title":"A review on various sniffing attacks and its mitigation techniques","volume":"12","author":"Prabadevi","year":"2018","journal-title":"Indones. J. Electr. Eng. Comput. Sci."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"322","DOI":"10.1016\/j.future.2020.08.010","article-title":"A framework for anomaly detection and classification in multiple IoT scenarios","volume":"114","author":"Cauteruccio","year":"2021","journal-title":"Future Gener. Comput. Syst."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"7946","DOI":"10.1109\/JIOT.2019.2907245","article-title":"High-reliability and low-latency wireless communication for internet of things: Challenges, fundamentals, and enabling technologies","volume":"6","author":"Ma","year":"2019","journal-title":"IEEE Internet Things J."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"59353","DOI":"10.1109\/ACCESS.2021.3073408","article-title":"Internet of things applications, security challenges, attacks, intrusion detection, and future visions: A systematic review","volume":"9","author":"Mishra","year":"2021","journal-title":"IEEE Access"},{"key":"ref_7","unstructured":"Hussain, S., Atallah, R., and Kamsin, A. (2018, January 25). DDoS reflection attack based on IoT: A case study. Proceedings of the Computer Science Online Conference, Zlin, Czech Republic."},{"key":"ref_8","first-page":"298","article-title":"Amplification DDoS attacks: Emerging threats and defense strategies","volume":"Volume 8708","author":"Colella","year":"2014","journal-title":"Lecture Notes in Computer Science (Including Subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"153826","DOI":"10.1109\/ACCESS.2020.3018170","article-title":"Research on artificial intelligence enhancing internet of things security: A survey","volume":"8","author":"Wu","year":"2020","journal-title":"IEEE Access"},{"key":"ref_10","unstructured":"Azaria, J., and Zawoznik, A. (2021, November 29). Inside a New DDoS Amplification Attack Vector via Memcached Servers. Imperva. Available online: https:\/\/www.imperva.com\/blog\/new-ddos-amplification-attack-vector-via-memcached-servers\/."},{"key":"ref_11","unstructured":"Dormando (2021, November 15). Memcached-a Distributed Memory Object Caching System. Available online: https:\/\/memcached.org\/."},{"key":"ref_12","unstructured":"Nishtala, R., Fugal, H., Grimm, S., Kwiatkowski, M., Lee, H., Li, C.H., McElroy, R., Paleczny, M., Peek, D., and Saab, P. (2013, January 2\u20135). Scaling memcache at facebook. Proceedings of the 10th USENIX Symposium on Networked Systems Design and Implementation, NSDI, Lombard, IL, USA."},{"key":"ref_13","doi-asserted-by":"crossref","unstructured":"Subramani, K., Perdisci, R., and Konte, M. (2021, January 14). Detecting and measuring in-the-wild DRDoS attacks at IXPs BT-detection of intrusions and malware, and vulnerability assessment. Proceedings of the International Conference on Detection of Intrusions and Malware, and Vulnerability Assessment, Saclay, France.","DOI":"10.1007\/978-3-030-80825-9_3"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"36","DOI":"10.1145\/2508148.2485926","article-title":"Thin servers with smart pipes: Designing soc accelerators for memcached","volume":"41","author":"Lim","year":"2013","journal-title":"ACM SIGARCH Comput. Archit. News"},{"key":"ref_15","doi-asserted-by":"crossref","unstructured":"Lu, Y., Sun, H., Wang, X., and Liu, X. (2014, January 8\u201312). R-Memcached: A consistent cache replication scheme with Memcached. Proceedings of the Posters & Demos Session, Bordeaux, France.","DOI":"10.1145\/2678508.2678523"},{"key":"ref_16","unstructured":"Blott, M., Liu, L., Karras, K., and Vissers, K. (2015, January 6\u20137). Scaling out to a single-node 80 gbps memcached server with 40 terabytes of memory. Proceedings of the 7th USENIX Workshop on Hot Topics in Storage and File Systems, Santa Clara, CA, USA."},{"key":"ref_17","doi-asserted-by":"crossref","unstructured":"Zaidenberg, N., Gavish, L., and Meir, Y. (2015, January 26\u201329). New caching algorithms performance evaluation. Proceedings of the 2015 International Symposium on Performance Evaluation of Computer and Telecommunication Systems (SPECTS), San Diego, CA, USA.","DOI":"10.1109\/SPECTS.2015.7285291"},{"key":"ref_18","unstructured":"Bakar, K.A., Shaharill, M.H.M., and Ahmed, M. (2010, January 13\u201314). Performance evaluation of a clustered memcache. Proceedings of the 3rd International Conference on Information and Communication Technology for the Moslem World (ICT4M), Jakarta, Indonesia."},{"key":"ref_19","doi-asserted-by":"crossref","unstructured":"Cheng, W., Ren, F., Jiang, W., and Zhang, T. (2017, January 5\u20138). Modeling and Analyzing Latency in the Memcached system. Proceedings of the 2017 IEEE 37th International Conference on Distributed Computing Systems (ICDCS), Atlanta, GA, USA.","DOI":"10.1109\/ICDCS.2017.122"},{"key":"ref_20","doi-asserted-by":"crossref","unstructured":"Singh, K., and Singh, A. (2018, January 25\u201327). Memcached DDoS exploits: Operations, vulnerabilities, preventions and mitigations. Proceedings of the 2018 IEEE 3rd International Conference on Computing, Communication and Security (ICCCS), Kathmandu, Nepal.","DOI":"10.1109\/CCCS.2018.8586810"},{"key":"ref_21","first-page":"345","article-title":"ICTCP: Incast congestion control for TCP in data-center networks","volume":"21","author":"Wu","year":"2012","journal-title":"IEEE ACM Trans. Netw"},{"key":"ref_22","doi-asserted-by":"crossref","unstructured":"Hasan, K., and Jeong, S.H. (2019). Efficient caching for data-driven IoT applications and fast content delivery with low latency in ICN. Appl. Sci., 9.","DOI":"10.3390\/app9224730"},{"key":"ref_23","doi-asserted-by":"crossref","unstructured":"Hasslinger, G., Heikkinen, J., Ntougias, K., Hasslinger, F., and Hohlfeld, O. (2018, January 7\u201311). Optimum caching versus LRU and LFU: Comparison and combined limited look-ahead strategies. Proceedings of the 2018 16th International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks (WiOpt), Shanghai, China.","DOI":"10.23919\/WIOPT.2018.8362880"},{"key":"ref_24","doi-asserted-by":"crossref","unstructured":"Ghayvat, H., Nitin Pandya, S., Bhattacharya, P., Zuhair, M., Rashid, M., Hakak, S., and Dev, K. (2021). CP-BDHCA: Blockchain-based Confidentiality-privacy preserving big data scheme for healthcare clouds and applications. IEEE J. Biomed. Health Inform., 1.","DOI":"10.1109\/JBHI.2021.3097237"},{"key":"ref_25","doi-asserted-by":"crossref","unstructured":"Silva, F.S.D., Silva, E., Neto, E.P., Lemos, M., Venancio Neto, A.J., and Esposito, F. (2020). A taxonomy of DDoS attack mitigation approaches featured by SDN technologies in IoT scenarios. Sensors, 20.","DOI":"10.3390\/s20113078"},{"key":"ref_26","doi-asserted-by":"crossref","unstructured":"Niyato, D., Kim, D.I., Wang, P., and Song, L. (2016, January 23\u201327). A novel caching mechanism for Internet of Things (IoT) sensing service with energy harvesting. Proceedings of the 2016 IEEE International Conference on Communications (ICC), Kuala Lumpur, Malaysia.","DOI":"10.1109\/ICC.2016.7511440"},{"key":"ref_27","unstructured":"Baptista, G., Carvalho, F., Colcher, S., and Endler, M. (June, January 30). A middleware for data-centric and dynamic distributed complex event processing for iot real-time analytics in the cloud. Proceedings of the 34th Brazilian Symposium on Computer Networks and Distributed Systems (SBRC\u20192016), Salvador, Brazil."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.jnca.2016.04.024","article-title":"Two-phase load balancing of in-memory key-value storages using network functions virtualization (NFV)","volume":"69","author":"Trajano","year":"2016","journal-title":"J. Netw. Comput. Appl."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"109","DOI":"10.1504\/IJAHUC.2020.105463","article-title":"Prefetching and caching schemes for IoT data in hierarchical edge computing architecture","volume":"33","author":"Chen","year":"2020","journal-title":"Int. J. Ad Hoc Ubiquitous Comput."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"4519","DOI":"10.1109\/TII.2018.2793350","article-title":"Secure data storage and searching for industrial IoT by integrating fog computing and cloud computing","volume":"14","author":"Fu","year":"2018","journal-title":"IEEE Trans. Ind. Inform."},{"key":"ref_31","doi-asserted-by":"crossref","unstructured":"Foremski, P., Nowak, S., Fr\u00f6hlich, P., Hern\u00e1ndez-Ramos, J.L., and Baldini, G. (2020). Autopolicy: Automated traffic policing for improved iot network security. Sensors, 20.","DOI":"10.3390\/s20154265"},{"key":"ref_32","doi-asserted-by":"crossref","unstructured":"Nishtala, R., Carpenter, P., Petrucci, V., and Martorell, X. (2017, January 4\u20138). Hipster: Hybrid task manager for latency-critical cloud workloads. Proceedings of the 2017 IEEE International Symposium on High Performance Computer Architecture (HPCA), Austin, TX, USA.","DOI":"10.1109\/HPCA.2017.13"},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"194269","DOI":"10.1109\/ACCESS.2020.3033942","article-title":"Bandwidth control mechanism and extreme gradient boosting algorithm for protecting software-defined networks against DDoS attacks","volume":"8","author":"Alamri","year":"2020","journal-title":"IEEE Access"},{"key":"ref_34","first-page":"102457","article-title":"T-CAD: A threshold based collaborative DDoS attack detection in multiple autonomous systems","volume":"51","author":"Singh","year":"2020","journal-title":"J. Inf. Secur. Appl."},{"key":"ref_35","doi-asserted-by":"crossref","unstructured":"Baskar, M., Ramkumar, J., Karthikeyan, C., Anbarasu, V., Balaji, A., and Arulananth, T.S. (2021). Low rate DDoS mitigation using real-time multi threshold traffic monitoring system. J. Ambient Intell. Humaniz. Comput., 1\u20139.","DOI":"10.1007\/s12652-020-02744-y"},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"79","DOI":"10.1016\/j.jpdc.2021.02.019","article-title":"Discriminating flash crowds from DDoS attacks using efficient thresholding algorithm","volume":"152","author":"David","year":"2021","journal-title":"J. Parallel Distrib. Comput."},{"key":"ref_37","unstructured":"Tourani, R., Torres, G., and Misra, S. (October, January 29). PERSIA: A PuzzlE-based InteReSt FloodIng Attack Countermeasure. Proceedings of the 7th ACM Conference on Information-Centric Networking, Montreal, QC, Canada."},{"key":"ref_38","doi-asserted-by":"crossref","unstructured":"Nguyen, H.V., Iacono, L.L., and Federrath, H. (2019, January 11\u201315). Your cache has fallen: Cache-poisoned denial-of-service attack. Proceedings of the 2019 ACM SIGSAC Conference on Computer and Communications Security, London, UK.","DOI":"10.1145\/3319535.3354215"},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"606","DOI":"10.1109\/JIOT.2017.2764418","article-title":"Dynamic resource caching in the IoT application layer for smart cities","volume":"5","author":"Sun","year":"2018","journal-title":"IEEE Internet Things J."},{"key":"ref_40","doi-asserted-by":"crossref","unstructured":"Naeem, M.A., Ali, R., Kim, B.S., Nor, S.A., and Hassan, S. (2018). A periodic caching strategy solution for the smart city in information-centric Internet of Things. Sustainability, 10.","DOI":"10.3390\/su10072576"},{"key":"ref_41","doi-asserted-by":"crossref","unstructured":"Li, R., Asaeda, H., Li, J., and Fu, X. (2017, January 21\u201325). A verifiable and flexible data sharing mechanism for information-centric IoT. Proceedings of the 2017 IEEE International Conference on Communications (ICC), Paris, France.","DOI":"10.1109\/ICC.2017.7996804"},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"1655","DOI":"10.1109\/JPROC.2019.2921977","article-title":"Deep Learning With Edge Computing: A Review","volume":"8","author":"Chen","year":"2019","journal-title":"Proc. IEEE."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"12058","DOI":"10.1109\/TVT.2020.3011518","article-title":"Coded caching for smart grid enabled HetNets with resource allocation and energy cooperation","volume":"69","author":"Yin","year":"2020","journal-title":"IEEE Trans. Veh. Technol."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"1477","DOI":"10.1109\/TPDS.2014.2321378","article-title":"Cloud computing applications for smart grid: A survey","volume":"26","author":"Bera","year":"2015","journal-title":"IEEE Trans. Parallel Distrib. Syst."},{"key":"ref_45","doi-asserted-by":"crossref","unstructured":"Huo, Y., Tu, W., Sheng, Z., and Leung, V.C. (2015, January 14\u201316). A survey of in-vehicle communications: Requirements, solutions and opportunities in IoT. Proceedings of the 2015 IEEE 2nd World Forum on Internet of Things (WF-IoT), Milan, Italy.","DOI":"10.1109\/WF-IoT.2015.7389040"},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"30","DOI":"10.1109\/TITS.2019.2917866","article-title":"Towards Next-Generation Vehicles Featuring the Vehicle Intelligence","volume":"21","author":"Payalan","year":"2019","journal-title":"IEEE Trans. Intell. Transp. Syst."},{"key":"ref_47","doi-asserted-by":"crossref","unstructured":"Bibani, O., Mouradian, C., Yangui, S., Glitho, R.H., Gaaloul, W., Hadj-Alouane, N.B., Morrow, M., and Polakos, P. (2016, January 12\u201315). A demo of iot healthcare application provisioning in hybrid cloud\/fog environment. Proceedings of the 2016 IEEE International Conference on Cloud Computing Technology and Science (CloudCom), Luxembourg, Germany.","DOI":"10.1109\/CloudCom.2016.0081"},{"key":"ref_48","doi-asserted-by":"crossref","unstructured":"Shukla, S., Hassan, M.F., Jung, L.T., Awang, A., and Khan, M.K. (2019, January 19\u201321). A 3-tier architecture for network latency reduction in healthcare internet-of-things using fog computing and machine learning. Proceedings of the ACM International Conference Proceeding Series, New York, NY, USA.","DOI":"10.1145\/3316615.3318222"},{"key":"ref_49","doi-asserted-by":"crossref","unstructured":"Djenna, A., and Sa\u00efdouni, D.E. (2018, January 24\u201326). Cyber attacks classification in IoT-based-healthcare infrastructure. Proceedings of the 2018 2nd Cyber Security in Networking Conference (CSNet), Paris, France.","DOI":"10.1109\/CSNET.2018.8602974"},{"key":"ref_50","doi-asserted-by":"crossref","unstructured":"Jovanov, E. (2019). Wearables meet IoT: Synergistic personal area networks (SPANs). Sensors, 19.","DOI":"10.3390\/s19194295"},{"key":"ref_51","doi-asserted-by":"crossref","first-page":"1004","DOI":"10.1016\/j.procs.2015.05.093","article-title":"Stream processing of healthcare sensor data: Studying user traces to identify challenges from a big data perspective","volume":"52","author":"Bonnaire","year":"2015","journal-title":"Procedia Comput. Sci."},{"key":"ref_52","doi-asserted-by":"crossref","first-page":"321","DOI":"10.13052\/jcsm2245-1439.832","article-title":"Prevalence of IoT protocols in telescope and honeypot measurements","volume":"8","author":"Metongnon","year":"2019","journal-title":"J. Cyber Secur. Mobil."},{"key":"ref_53","doi-asserted-by":"crossref","first-page":"107391","DOI":"10.1016\/j.comnet.2020.107391","article-title":"Detection of zero-day attacks: An unsupervised port-based approach","volume":"180","author":"Blaise","year":"2020","journal-title":"Comput. Netw. Elsevier"},{"key":"ref_54","unstructured":"Zahravi, A. (2021, November 13). Momentum Botnet\u2019s Newest DDoS Attacks and IoT Exploits. Trend Micro. Available online: https:\/\/www.trendmicro.com\/en_in\/research\/19\/l\/ddos-attacks-and-iot-exploits-new-activity-from-momentum-botnet.html."},{"key":"ref_55","unstructured":"(2021, November 13). CVE Details, CVE Security Vulnerability Database. Available online: https:\/\/www.cvedetails.com\/."},{"key":"ref_56","unstructured":"(2021, November 12). Memcrashed DDoS Exploit Tool. GitHub. Available online: https:\/\/github.com\/649\/Memcrashed-DDoS-Exploit\/."},{"key":"ref_57","unstructured":"(2021, November 13). Shodan. Available online: https:\/\/www.shodan.io\/."},{"key":"ref_58","doi-asserted-by":"crossref","unstructured":"Chen, L., Li, J., Ma, R., Guan, H., and Jacobsen, H.A. (2019, January 9\u201313). EnclaveCache: A secure and scalable key-value cache in multi-tenant clouds using Intel SGX. Proceedings of the 20th International Middleware Conference, Davis, CA, USA.","DOI":"10.1145\/3361525.3361533"}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/21\/23\/8071\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T07:38:55Z","timestamp":1760168335000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/21\/23\/8071"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,12,2]]},"references-count":58,"journal-issue":{"issue":"23","published-online":{"date-parts":[[2021,12]]}},"alternative-id":["s21238071"],"URL":"https:\/\/doi.org\/10.3390\/s21238071","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2021,12,2]]}}}