{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,18]],"date-time":"2026-03-18T02:35:38Z","timestamp":1773801338662,"version":"3.50.1"},"reference-count":57,"publisher":"Institute of Electrical and Electronics Engineers (IEEE)","license":[{"start":{"date-parts":[[2021,1,1]],"date-time":"2021-01-01T00:00:00Z","timestamp":1609459200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/legalcode"}],"funder":[{"name":"a grant of the Romanian Ministry of Research and Innovation, CCCDI-UEFISCDI","award":["462PED\/28.10.2020"],"award-info":[{"award-number":["462PED\/28.10.2020"]}]},{"name":"a grant of the Romanian Ministry of Research and Innovation, CCCDI-UEFISCDI","award":["PN-III-P2-2.1-PED-2019-1198"],"award-info":[{"award-number":["PN-III-P2-2.1-PED-2019-1198"]}]},{"name":"within PNCDI III"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IEEE Access"],"published-print":{"date-parts":[[2021]]},"DOI":"10.1109\/access.2021.3075175","type":"journal-article","created":{"date-parts":[[2021,4,23]],"date-time":"2021-04-23T20:08:23Z","timestamp":1619208503000},"page":"64427-64444","source":"Crossref","is-referenced-by-count":23,"title":["Insights Into Energy Indicators Analytics Towards European Green Energy Transition Using Statistics and Self-Organizing Maps"],"prefix":"10.1109","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7340-8870","authenticated-orcid":false,"given":"Cristian","family":"Bucur","sequence":"first","affiliation":[{"name":"Department of Cybernetics, Economic Informatics, Finance and Accountancy, Petroleum-Gas University of Ploiesti, Ploiesti, Romania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3507-2800","authenticated-orcid":false,"given":"Bogdan George","family":"Tudorica","sequence":"additional","affiliation":[{"name":"Department of Cybernetics, Economic Informatics, Finance and Accountancy, Petroleum-Gas University of Ploiesti, Ploiesti, Romania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9005-5181","authenticated-orcid":false,"given":"Simona-Vasilica","family":"Oprea","sequence":"additional","affiliation":[{"name":"Department of Economic Informatics and Cybernetics, Bucharest University of Economic Studies, Bucharest, Romania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dumitru","family":"Nancu","sequence":"additional","affiliation":[{"name":"Department of Finance and Accounting, Ovidius University of Constanta, Constanta, Romania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dorel Mihail","family":"Dusmanescu","sequence":"additional","affiliation":[{"name":"Department of Cybernetics, Economic Informatics, Finance and Accountancy, Petroleum-Gas University of Ploiesti, Ploiesti, Romania"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"263","reference":[{"key":"ref39","year":"2005","journal-title":"Energy Indicators for Sustainable Development Guidelines and Methodologies"},{"key":"ref38","year":"2014","journal-title":"Eurostat Energy Transport and Environment Indicators"},{"key":"ref33","year":"2014","journal-title":"Energy Efficiency Indicators Fundamentals on Statistics"},{"key":"ref32","doi-asserted-by":"publisher","DOI":"10.1016\/j.apenergy.2015.08.126"},{"key":"ref31","doi-asserted-by":"publisher","DOI":"10.1016\/j.enbuild.2017.03.071"},{"key":"ref30","doi-asserted-by":"publisher","DOI":"10.1109\/TSG.2016.2548565"},{"key":"ref37","doi-asserted-by":"publisher","DOI":"10.1016\/j.enpol.2009.03.061"},{"key":"ref36","doi-asserted-by":"publisher","DOI":"10.1016\/j.enpol.2009.02.006"},{"key":"ref35","year":"2017","journal-title":"Energy efficiency indicators Highlights"},{"key":"ref34","year":"2014","journal-title":"Energy Efficiency Indicators? Essentials for Policy Making"},{"key":"ref28","doi-asserted-by":"publisher","DOI":"10.3390\/su12083442"},{"key":"ref27","doi-asserted-by":"publisher","DOI":"10.1186\/s40327-018-0064-7"},{"key":"ref29","doi-asserted-by":"publisher","DOI":"10.1080\/13511610.2012.660330"},{"key":"ref2","doi-asserted-by":"publisher","DOI":"10.1016\/j.rser.2019.109489"},{"key":"ref1","doi-asserted-by":"publisher","DOI":"10.3390\/su10051515"},{"key":"ref20","doi-asserted-by":"publisher","DOI":"10.1016\/j.enbuild.2018.02.040"},{"key":"ref22","year":"2020","journal-title":"Energy Statistics"},{"key":"ref21","year":"0","journal-title":"Share of Renewable Energy in Gross Final Energy Consumption"},{"key":"ref24","doi-asserted-by":"publisher","DOI":"10.1016\/j.cie.2018.05.053"},{"key":"ref23","author":"national statistics","year":"2018","journal-title":"Low Carbon and Renewable Energy Economy UK 2018"},{"key":"ref26","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-319-13290-7_7"},{"key":"ref25","doi-asserted-by":"publisher","DOI":"10.3390\/en12071301"},{"key":"ref50","year":"2020","journal-title":"Correlation Matrix? A Quick Start Guide to Analyze Format and Visualize a Correlation Matrix Using R Software"},{"key":"ref51","author":"leeper","year":"2017","journal-title":"Missing Data Handling"},{"key":"ref57","author":"rstudio","year":"2019","journal-title":"Self-Organizing Maps"},{"key":"ref56","author":"shane","year":"2014","journal-title":"Self-Organising Maps for Customer Segmentation Using R"},{"key":"ref55","author":"oldach","year":"2019","journal-title":"10 Tips for Choosing the Optimal Number of Clusters"},{"key":"ref54","year":"2020","journal-title":"Self-Organising Maps for Customer Segmentation Using R"},{"key":"ref53","author":"ralhan","year":"2018","journal-title":"Self Organizing Maps"},{"key":"ref52","author":"ciaburro","year":"2019","journal-title":"Neural Networks with R—Smart Models Using CNN RNN Deep Learning and Artificial Intelligence Principles"},{"key":"ref10","doi-asserted-by":"publisher","DOI":"10.3390\/en10122101"},{"key":"ref11","doi-asserted-by":"publisher","DOI":"10.1016\/j.apenergy.2012.11.050"},{"key":"ref40","doi-asserted-by":"publisher","DOI":"10.1016\/j.energy.2006.08.006"},{"key":"ref12","doi-asserted-by":"publisher","DOI":"10.1016\/S2212-5671(14)00094-X"},{"key":"ref13","doi-asserted-by":"publisher","DOI":"10.3846\/tede.2019.7454"},{"key":"ref14","doi-asserted-by":"publisher","DOI":"10.1016\/j.rser.2017.08.055"},{"key":"ref15","doi-asserted-by":"publisher","DOI":"10.1016\/j.apenergy.2017.06.073"},{"key":"ref16","doi-asserted-by":"publisher","DOI":"10.1109\/TSG.2018.2818167"},{"key":"ref17","doi-asserted-by":"publisher","DOI":"10.1016\/j.enpol.2017.12.025"},{"key":"ref18","doi-asserted-by":"publisher","DOI":"10.1016\/j.apenergy.2015.05.101"},{"key":"ref19","doi-asserted-by":"publisher","DOI":"10.1016\/j.jup.2016.11.001"},{"key":"ref4","doi-asserted-by":"publisher","DOI":"10.1007\/978-1-4614-9411-9"},{"key":"ref3","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0173282"},{"key":"ref6","doi-asserted-by":"publisher","DOI":"10.1109\/TIE.2006.878356"},{"key":"ref5","year":"2019","journal-title":"International Renewable Energy Agency—IRENA FUTURE OF SOLAR PHOTOVOLTAIC Deployment Investment Technology Grid Integration and Socio-Economic Aspects"},{"key":"ref8","doi-asserted-by":"publisher","DOI":"10.1049\/iet-rpg.2015.0378"},{"key":"ref7","doi-asserted-by":"publisher","DOI":"10.3390\/en11010251"},{"key":"ref49","author":"helwig","year":"2017","journal-title":"Data Covariance and Correlation Matrix"},{"key":"ref9","doi-asserted-by":"publisher","DOI":"10.1016\/j.eneco.2015.06.002"},{"key":"ref46","author":"hut","year":"2020","journal-title":"Correlation Tests Correlation Matrix and Corresponding Visualization Methods in R"},{"key":"ref45","year":"2020","journal-title":"Correlation Analysis"},{"key":"ref48","year":"2020","journal-title":"Correlation_and_Dependence"},{"key":"ref47","year":"2020","journal-title":"Correlation Test Between Two Variables in R"},{"key":"ref42","year":"2020","journal-title":"Environmental Tax Revenues"},{"key":"ref41","year":"2020","journal-title":"Total Environmental Investments"},{"key":"ref44","doi-asserted-by":"publisher","DOI":"10.2172\/1427970"},{"key":"ref43","year":"2020","journal-title":"Environmental Protection Expenditure of the Public Sector by Type"}],"container-title":["IEEE Access"],"original-title":[],"link":[{"URL":"http:\/\/xplorestaging.ieee.org\/ielx7\/6287639\/9312710\/09411840.pdf?arnumber=9411840","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2022,9,22]],"date-time":"2022-09-22T23:09:47Z","timestamp":1663888187000},"score":1,"resource":{"primary":{"URL":"https:\/\/ieeexplore.ieee.org\/document\/9411840\/"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021]]},"references-count":57,"URL":"https:\/\/doi.org\/10.1109\/access.2021.3075175","relation":{},"ISSN":["2169-3536"],"issn-type":[{"value":"2169-3536","type":"electronic"}],"subject":[],"published":{"date-parts":[[2021]]}}}