Martín-Martín, Alberto; Orduña Malea, Enrique; Ayllon, Juan M.; Delgado-López-Cózar, Emilio(Consejo Superior de Investigaciones Científicas (CSIC), 2016)
The main objective of this paper is to identify and define the core characteristics of the set of highly-cited documents in Google Scholar (document types, language, free availability, sources, and number of versions), on ...
Martín-Martín, Alberto; Orduña Malea, Enrique; Ayllon, Juan M.; Delgado-López-Cózar, Emilio(SpringerAkadémiai Kiadó, 2016-06)
A study released by the Google Scholar team found an apparently increasing fraction of citations to old articles from studies published in the last 24 years (1990-2013). To demonstrate this finding we conducted a complementary ...
Orduña Malea, Enrique; Ayllon, Juan M.; Martín-Martín, Alberto; Delgado-López-Cózar, Emilio(SpringerAkadémiai Kiadó, 2015-09)
The emergence of academic search engines (mainly Google Scholar and Microsoft Academic Search) that aspire to index the entirety of current academic knowledge has revived and increased interest in the size of the academic ...