{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,28]],"date-time":"2026-04-28T19:00:24Z","timestamp":1777402824552,"version":"3.51.4"},"reference-count":39,"publisher":"Springer Science and Business Media LLC","issue":"3","license":[{"start":{"date-parts":[[2015,5,31]],"date-time":"2015-05-31T00:00:00Z","timestamp":1433030400000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/www.springer.com\/tdm"}],"funder":[{"name":"Direcci\u00f3n General de Investigaci\u00f3n y Gesti\u00f3n del Plan Nacional de I+D+I Ministerio de Econom\u00eda y Competitividad","award":["HAR2011-30383-C02-02"],"award-info":[{"award-number":["HAR2011-30383-C02-02"]}]},{"name":"Consejer\u00eda de Educaci\u00f3n, Cultura y Deportes de la Generalitat Valenciana (Espa\u00f1a)","award":["APOSTD\/2013\/002"],"award-info":[{"award-number":["APOSTD\/2013\/002"]}]},{"DOI":"10.13039\/501100003329","name":"Ministerio de Econom\u00eda y Competitividad","doi-asserted-by":"publisher","award":["BES-2012-054980"],"award-info":[{"award-number":["BES-2012-054980"]}],"id":[{"id":"10.13039\/501100003329","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003176","name":"Ministerio de Educaci\u00f3n, Cultura y Deporte","doi-asserted-by":"publisher","award":["FPU2013\/05863"],"award-info":[{"award-number":["FPU2013\/05863"]}],"id":[{"id":"10.13039\/501100003176","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["link.springer.com"],"crossmark-restriction":false},"short-container-title":["Scientometrics"],"published-print":{"date-parts":[[2015,9]]},"DOI":"10.1007\/s11192-015-1614-6","type":"journal-article","created":{"date-parts":[[2015,5,30]],"date-time":"2015-05-30T02:19:59Z","timestamp":1432952399000},"page":"931-949","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":100,"title":["Methods for estimating the size of Google Scholar"],"prefix":"10.1007","volume":"104","author":[{"given":"Enrique","family":"Orduna-Malea","sequence":"first","affiliation":[]},{"given":"Juan M.","family":"Ayll\u00f3n","sequence":"additional","affiliation":[]},{"given":"Alberto","family":"Mart\u00edn-Mart\u00edn","sequence":"additional","affiliation":[]},{"given":"Emilio","family":"Delgado L\u00f3pez-C\u00f3zar","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2015,5,31]]},"reference":[{"issue":"9","key":"1614_CR1","doi-asserted-by":"crossref","first-page":"55","DOI":"10.1145\/383694.383707","volume":"44","author":"IA Adamic","year":"2001","unstructured":"Adamic, I. A., & Huberman, B. A. (2001). The web\u2019s hidden order. Communications of the ACM, 44(9), 55\u201359.","journal-title":"Communications of the ACM"},{"key":"1614_CR2","doi-asserted-by":"crossref","unstructured":"Adar, E., Teevan, J., & Dumais, S. T. (2009). Resonance on the web: Web dynamics and revisitation patterns. In Proceedings of the SIGCHI conference on human factors in computing systems (pp.1381\u20131390).","DOI":"10.1145\/1518701.1518909"},{"issue":"2","key":"1614_CR3","doi-asserted-by":"crossref","first-page":"343","DOI":"10.1007\/s11192-011-0582-8","volume":"91","author":"IF Aguillo","year":"2012","unstructured":"Aguillo, I. F. (2012). Is Google Scholar useful for bibliometrics? A webometric analysis. Scientometrics, 91(2), 343\u2013351.","journal-title":"Scientometrics"},{"issue":"6749","key":"1614_CR4","doi-asserted-by":"crossref","first-page":"130","DOI":"10.1038\/43601","volume":"401","author":"R Albert","year":"1999","unstructured":"Albert, R., Jeong, H., & Barabasi, A. L. (1999). Internet\u2014Diameter of the world-wide web. Nature, 401(6749), 130\u2013131.","journal-title":"Nature"},{"issue":"5439","key":"1614_CR5","doi-asserted-by":"crossref","first-page":"509","DOI":"10.1126\/science.286.5439.509","volume":"282","author":"A-L Barabasi","year":"1999","unstructured":"Barabasi, A.-L., & Albert, R. (1999). Emergence of scaling in random networks. Science, 282(5439), 509\u2013512.","journal-title":"Science"},{"key":"1614_CR6","volume-title":"Creating the market university: How academic science became an economic engine","author":"Elizabeth P Berman","year":"2012","unstructured":"Berman, Elizabeth P. (2012). Creating the market university: How academic science became an economic engine. New Jersey: Princeton University Press."},{"issue":"1\u20136","key":"1614_CR7","doi-asserted-by":"crossref","first-page":"257","DOI":"10.1016\/S1389-1286(00)00045-1","volume":"33","author":"BE Brewington","year":"2000","unstructured":"Brewington, B. E., & Cybenko, G. (2000). How dynamic is the Web? Computer Networks, 33(1\u20136), 257\u2013276.","journal-title":"Computer Networks"},{"issue":"4","key":"1614_CR8","doi-asserted-by":"crossref","first-page":"293","DOI":"10.1016\/j.lisr.2011.02.001","volume":"33","author":"T Cothran","year":"2011","unstructured":"Cothran, T. (2011). Google Scholar acceptance and use among graduate students: A quantitative study. Library and Information Science Research, 33(4), 293\u2013301.","journal-title":"Library and Information Science Research"},{"issue":"2","key":"1614_CR23","doi-asserted-by":"crossref","first-page":"101","DOI":"10.1087\/20130206","volume":"26","author":"E Delgado L\u00f3pez-C\u00f3zar","year":"2013","unstructured":"Delgado L\u00f3pez-C\u00f3zar, E., & Cabezas-Clavijo, \u00c1. (2013). Ranking journals: Could Google scholar metrics be an alternative to journal citation reports and Scimago journal rank? Learned Publishing, 26(2), 101\u2013113.","journal-title":"Learned Publishing"},{"issue":"2","key":"1614_CR9","doi-asserted-by":"crossref","first-page":"1547","DOI":"10.1007\/s11192-013-1089-2","volume":"98","author":"JCF Winter De","year":"2014","unstructured":"De Winter, J. C. F., Zadpoor, A., & Dodou, D. (2014). The expansion of Google Scholar versus Web of Science: A longitudinal study. Scientometrics, 98(2), 1547\u20131565.","journal-title":"Scientometrics"},{"key":"1614_CR40","doi-asserted-by":"crossref","unstructured":"Dobra, A., & Fienberg, S. E. (2004). How large is the world wide web?. In M. Levene & A. Poulovassilis (Eds.), Web dynamics (pp. 23\u201343). Springer: Berlin.","DOI":"10.1007\/978-3-662-10874-1_2"},{"issue":"1","key":"1614_CR10","doi-asserted-by":"crossref","first-page":"565","DOI":"10.1007\/s11192-013-0975-y","volume":"98","author":"A-W Harzing","year":"2014","unstructured":"Harzing, A.-W. (2014). A longitudinal study of Google Scholar coverage between 2012 and 2013. Scientometrics, 98(1), 565\u2013575.","journal-title":"Scientometrics"},{"issue":"2","key":"1614_CR11","doi-asserted-by":"crossref","first-page":"188","DOI":"10.1108\/14684520610659201","volume":"30","author":"P Jacs\u00f3","year":"2006","unstructured":"Jacs\u00f3, P. (2006). Dubious hit counts and cuckoo\u2019s eggs. Online Information Review, 30(2), 188\u2013193.","journal-title":"Online Information Review"},{"issue":"1","key":"1614_CR12","doi-asserted-by":"crossref","first-page":"102","DOI":"10.1108\/14684520810866010","volume":"32","author":"P Jacs\u00f3","year":"2008","unstructured":"Jacs\u00f3, P. (2008). Google scholar revisited. Online Information Review, 32(1), 102\u2013114.","journal-title":"Online Information Review"},{"issue":"6","key":"1614_CR13","doi-asserted-by":"crossref","first-page":"983","DOI":"10.1108\/14684521111210788","volume":"35","author":"P Jacs\u00f3","year":"2011","unstructured":"Jacs\u00f3, P. (2011). The pros and cons of Microsoft Academic Search from a bibliometric perspective. Online Information Review, 35(6), 983\u2013997.","journal-title":"Online Information Review"},{"key":"1614_CR14","unstructured":"Joint Information Systems Committee (2012). Researchers of tomorrow: The research behaviour of generation Y doctoral students. http:\/\/www.jisc.ac.uk\/media\/documents\/publications\/reports\/2012\/Researchers-of-Tomorrow.pdf . Accessed 10 October 2014."},{"issue":"5","key":"1614_CR15","doi-asserted-by":"crossref","first-page":"e93949","DOI":"10.1371\/journal.pone.0093949","volume":"9","author":"M Khabsa","year":"2014","unstructured":"Khabsa, M., & Giles, C. L. (2014). The number of scholarly documents on the public web. PLoS ONE, 9(5), e93949.","journal-title":"PLoS ONE"},{"issue":"2","key":"1614_CR16","doi-asserted-by":"crossref","first-page":"162","DOI":"10.1002\/(SICI)1097-4571(1999)50:2<162::AID-ASI7>3.0.CO;2-B","volume":"50","author":"W Koehler","year":"1999","unstructured":"Koehler, W. (1999). An analysis of web page and web site constancy and permanence. Journal of the American Society for Information Science, 50(2), 162\u2013180.","journal-title":"Journal of the American Society for Information Science"},{"issue":"2","key":"1614_CR17","doi-asserted-by":"crossref","first-page":"162","DOI":"10.1002\/asi.10018","volume":"53","author":"W Koehler","year":"2002","unstructured":"Koehler, W. (2002). Web page change and persistence\u2014A four-year longitudinal study. Journal of the American Society for Information Science and Technology, 53(2), 162\u2013171.","journal-title":"Journal of the American Society for Information Science and Technology"},{"key":"1614_CR18","unstructured":"Koehler, W. (2004). A longitudinal study of Web pages continued a consideration of document persistence. Information Research, 9(2). http:\/\/informationr.net\/ir\/9-2\/paper174.html . Accessed 10 October 2014."},{"issue":"2","key":"1614_CR19","doi-asserted-by":"crossref","first-page":"273","DOI":"10.1007\/s11192-008-0217-x","volume":"74","author":"K Kousha","year":"2008","unstructured":"Kousha, K., & Thelwall, M. (2008). Sources of Google Scholar citations outside the Science Citation Index: A comparison between four science disciplines. Scientometrics, 74(2), 273\u2013294.","journal-title":"Scientometrics"},{"issue":"5360","key":"1614_CR20","doi-asserted-by":"crossref","first-page":"98","DOI":"10.1126\/science.280.5360.98","volume":"280","author":"S Lawrence","year":"1998","unstructured":"Lawrence, S., & Giles, C. (1998). Searching the world wide web. Science, 280(5360), 98\u2013100.","journal-title":"Science"},{"issue":"6740","key":"1614_CR21","doi-asserted-by":"crossref","first-page":"107","DOI":"10.1038\/21987","volume":"400","author":"S Lawrence","year":"1999","unstructured":"Lawrence, S., & Giles, C. L. (1999). Accessibility of information on the web. Nature, 400(6740), 107.","journal-title":"Nature"},{"issue":"3","key":"1614_CR22","doi-asserted-by":"crossref","first-page":"277","DOI":"10.1016\/S1389-1286(02)00209-8","volume":"39","author":"M Levene","year":"2002","unstructured":"Levene, M., Fenner, T., Loizou, G., & Wheeldon, R. (2002). A stochastic model for the evolution of the web. Computer Networks, 39(3), 277\u2013287.","journal-title":"Computer Networks"},{"key":"1614_CR24","unstructured":"Mart\u00edn-Mart\u00edn, A., Orduna-Malea, E., Ayll\u00f3n, J. M., & Delgado L\u00f3pez-C\u00f3zar, E. (2014). Does Google Scholar contain all highly cited documents (1950\u20132013)? Granada: EC3 Working Papers, 19. http:\/\/arxiv.org\/abs\/1410.8464 . Accessed 20 March 2015."},{"issue":"13","key":"1614_CR25","doi-asserted-by":"crossref","first-page":"2105","DOI":"10.1002\/asi.20677","volume":"58","author":"LI Meho","year":"2007","unstructured":"Meho, L. I., & Yang, K. (2007). Impact of data sources on citation counts and rankings of LIS faculty: Web of Science versus Scopus and Google Scholar. Journal of the American Society for Information Science and Technology, 58(13), 2105\u20132125.","journal-title":"Journal of the American Society for Information Science and Technology"},{"issue":"9","key":"1614_CR26","first-page":"e7441","volume":"12","author":"SM Miri","year":"2012","unstructured":"Miri, S. M., Raoofi, A., & Heidari, Z. (2012). Citation analysis of hepatitis monthly by journal citation report (ISI), Google Scholar, and Scopus. Hepatitis Monthly, 12(9), e7441.","journal-title":"Hepatitis Monthly"},{"issue":"3","key":"1614_CR28","doi-asserted-by":"crossref","first-page":"2353","DOI":"10.1007\/s11192-013-1164-8","volume":"98","author":"E Orduna-Malea","year":"2014","unstructured":"Orduna-Malea, E., & Delgado L\u00f3pez-C\u00f3zar, E. (2014). Google Scholar Metrics evolution: An analysis according to languages. Scientometrics, 98(3), 2353\u20132367.","journal-title":"Scientometrics"},{"issue":"7","key":"1614_CR29","doi-asserted-by":"crossref","first-page":"936","DOI":"10.1108\/OIR-07-2014-0169","volume":"38","author":"E Orduna-Malea","year":"2014","unstructured":"Orduna-Malea, E., Martin-Martin, A., Ayll\u00f3n, Juan M., & Delgado L\u00f3pez-C\u00f3zar, E. (2014). The silent fading of an academic search engine: The case of Microsoft Academic Search. Online Information Review, 38(7), 936\u2013953.","journal-title":"Online Information Review"},{"issue":"5","key":"1614_CR30","doi-asserted-by":"crossref","first-page":"493","DOI":"10.3145\/epi.2009.sep.02","volume":"18","author":"E Orduna-Malea","year":"2009","unstructured":"Orduna-Malea, E., Serrano-Cobos, J., & Lloret-Romero, N. (2009). Las universidades p\u00fablicas espa\u00f1olas en Google Scholar: Presencia y evoluci\u00f3n de su publicaci\u00f3n acad\u00e9mica web. El profesional de la informaci\u00f3n, 18(5), 493\u2013500.","journal-title":"El profesional de la informaci\u00f3n"},{"key":"1614_CR31","volume-title":"Academic search engines: A quantitative outlook","author":"JL Ortega","year":"2014","unstructured":"Ortega, J. L. (2014). Academic search engines: A quantitative outlook. Netherlands: Elsevier. Chandos Information Professional Series."},{"issue":"4","key":"1614_CR32","doi-asserted-by":"crossref","first-page":"344","DOI":"10.1177\/0165551506065785","volume":"32","author":"JL Ortega","year":"2006","unstructured":"Ortega, J. L., Aguillo, I., & Prieto, J. A. (2006). Longitudinal study of content and elements in the scientific web environment. Journal of Information Science, 32(4), 344\u2013351.","journal-title":"Journal of Information Science"},{"issue":"3","key":"1614_CR33","doi-asserted-by":"crossref","first-page":"523","DOI":"10.1007\/s11192-007-1695-y","volume":"71","author":"N Payne","year":"2007","unstructured":"Payne, N., & Thelwall, M. (2007). A longitudinal study of academic webs: Growth and stabilisation. Scientometrics, 71(3), 523\u2013539.","journal-title":"Scientometrics"},{"issue":"5","key":"1614_CR34","doi-asserted-by":"crossref","first-page":"707","DOI":"10.1108\/00220410810899727","volume":"64","author":"N Payne","year":"2008","unstructured":"Payne, N., & Thelwall, M. (2008a). Do academic link types change over time? Journal of Documentation, 64(5), 707\u2013720.","journal-title":"Journal of Documentation"},{"issue":"1","key":"1614_CR35","doi-asserted-by":"crossref","first-page":"3","DOI":"10.1177\/0165551507079417","volume":"34","author":"N Payne","year":"2008","unstructured":"Payne, N., & Thelwall, M. (2008b). Longitudinal trends in academic web links. Journal of Information Science, 34(1), 3\u201314.","journal-title":"Journal of Information Science"},{"issue":"4","key":"1614_CR36","doi-asserted-by":"crossref","first-page":"469","DOI":"10.1177\/0165551509103598","volume":"35","author":"A Uyar","year":"2009","unstructured":"Uyar, A. (2009). Investigation of the accuracy of search engine hit counts. Journal of Information Science, 35(4), 469\u2013480.","journal-title":"Journal of Information Science"},{"issue":"7513","key":"1614_CR37","doi-asserted-by":"crossref","first-page":"126","DOI":"10.1038\/512126a","volume":"512","author":"R Noorden Van","year":"2014","unstructured":"Van Noorden, R. (2014). Scientists and the social network. Nature, 512(7513), 126\u2013129.","journal-title":"Nature"},{"issue":"4","key":"1614_CR38","doi-asserted-by":"crossref","first-page":"318","DOI":"10.1016\/j.lisr.2013.04.006","volume":"35","author":"D Wilkinson","year":"2013","unstructured":"Wilkinson, D., & Thelwall, M. (2013). Search markets and search results: The case of Bing. Library and Information Science Research, 35(4), 318\u2013325.","journal-title":"Library and Information Science Research"},{"issue":"1","key":"1614_CR39","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1002\/meet.14504301185","volume":"43","author":"K Yang","year":"2006","unstructured":"Yang, K., & Meho, L. I. (2006). Citation Analysis: A Comparison of Google Scholar, Scopus, and Web of Science. Proceedings of the American Society for Information Science and Technology, 43(1), 1\u201315.","journal-title":"Proceedings of the American Society for Information Science and Technology"}],"container-title":["Scientometrics"],"original-title":[],"language":"en","link":[{"URL":"http:\/\/link.springer.com\/content\/pdf\/10.1007\/s11192-015-1614-6.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"http:\/\/link.springer.com\/article\/10.1007\/s11192-015-1614-6\/fulltext.html","content-type":"text\/html","content-version":"vor","intended-application":"text-mining"},{"URL":"http:\/\/link.springer.com\/content\/pdf\/10.1007\/s11192-015-1614-6","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2019,8,25]],"date-time":"2019-08-25T17:13:29Z","timestamp":1566753209000},"score":1,"resource":{"primary":{"URL":"http:\/\/link.springer.com\/10.1007\/s11192-015-1614-6"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2015,5,31]]},"references-count":39,"journal-issue":{"issue":"3","published-print":{"date-parts":[[2015,9]]}},"alternative-id":["1614"],"URL":"https:\/\/doi.org\/10.1007\/s11192-015-1614-6","relation":{},"ISSN":["0138-9130","1588-2861"],"issn-type":[{"value":"0138-9130","type":"print"},{"value":"1588-2861","type":"electronic"}],"subject":[],"published":{"date-parts":[[2015,5,31]]}}}