A bibliometric study of grey literature (2007-2019)

Purpose The purpose of this paper is to spotlight the research output in the field of grey literature (GL) during the 13-year period between 2007 and 2019 as reflected in the Scopus database. Design/methodology/approach This study has used Scopus, an abstract and citation database of peer-reviewed literature, to collect data for the specified 13-year period. The sources, which had “grey literature” in their titles, were considered for the study and the period was from 2007 to 2019. The downloaded results were analysed using specific parameters. The SPSS and Excel have been used for analysing the retrieved data. The VOSviewer has been used for visualizing the network. Findings Scopus indexes different kinds of documents such as articles, books, chapters, conference papers, editorial, erratum, letters, notes, reviews and short surveys. There were 345 publications, which received 309 citations. GL-Conference Series: Conference Proceedings published the most number of articles. The majority 51.9 per cent of the articles were published in collaboration with authors from European countries. The term “grey literature” occurred most commonly as author keyword and index term. Originality/value The present study highlights how the area of GL has evolved during the 13-year period. The findings of the study pave the way for more detailed exploration of GL, which has relevance for the researchers.