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Google Scholar, Web of Science, and Scopus: a systematic comparison of citations in 252 subject categories
Alberto Martin-Martin is funded for a four-year doctoral fellowship (FPU2013/05863) granted by the Ministerio de Educacion, Cultura, y Deportes (Spain). An international mobility grant fromExpand
The evolution of research activity in Spain: The impact of the National Commission for the Evaluation of Research Activity (CNEAI)
This article outlines the evolution of international scientific production in Spain over the last 25 years, a period characterised by steady growth in research production. The following stages inExpand
The Google scholar experiment: How to index false papers and manipulate bibliometric indicators
The results of an experiment undertaken to analyze Google Scholar's capacity to detect citation‐counting manipulation are shown and it is discussed how the effects of such an outburst could affect the future development of such products, at both the individual level and the journal level. Expand
Coverage of highly-cited documents in Google Scholar, Web of Science, and Scopus: a multidisciplinary comparison
The main conclusion is that the data about highly-cited documents available in the inclusive database Google Scholar does indeed reveal significant coverage deficiencies in Web of Science and Scopus in several areas of research. Expand
Evidence of Open Access of scientific publications in Google Scholar: a large-scale analysis
The data extracted from Google Scholar yielded very similar results to those found by other studies that analysed similar samples of documents, but employed different methods to find evidence of OA, thus suggesting a relative consistency among methods. Expand
Towards a Book Publishers Citation Reports. First approach using the Book Citation Index
This article analyzes different impact indicators referred to the scientific publishers included in the Book Citation Index for the Social Sciences and Humanities fields during 2006-2011 with a total of 19 rankings according to the different disciplines in Humanities & Arts and Social Sciences & Law. Expand
About the size of Google Scholar: playing the numbers
The main objective of this working paper is to calculate the size of Google Scholar at present, and presents, applies and discusses up to 4 empirical methods: Khabsa & Giles's method, an estimate based on empirical data, and estimates based on direct queries and absurd queries. Expand
The counting house: measuring those who count. Presence of Bibliometrics, Scientometrics, Informetrics, Webometrics and Altmetrics in the Google Scholar Citations, ResearcherID, ResearchGate,
It is found that it is feasible to depict an accurate representation of the current state of the Bibliometrics community using data from GSC (the most influential authors, documents, journals, and publishers), and a taxonomy of all the errors that may affect the reliability of the data contained in each of these platforms is presented. Expand
Coverage, field specialisation and the impact of scientific publishers indexed in the Book Citation Index
The authors conducted a descriptive study in which they examined coverage by discipline, publisher distribution by field and country of publication, and publisher impact of Thomson Reuters' Book Citation Index. Expand
Ranking of departments and researchers within a university using two different databases: Web of Science versus Scopus
It was concluded that the difference in the number of citations found did not correspond to the difference of coverage of WoS and Scopus, and it was found that both databases generate similar results. Expand