The Science Citation Index (SCI)
International Scientific Institute (ISI) is one the world's leading source of information about indexing services, journals and research conferences. The Science Citation Index (SCI) is a famous product developed by International Scientific Institute (ISI) in 1964. The Science Citation Index (SCI) is a citation index which covers more than 6,500 journals, across 150 disciplines, from 1900. It is now owned by Thomson Reuters.
The SCImago Journal & Country Rank (SJR)
The SCImago Journal & Country Rank is a portal that includes the journals and country scientific indicators developed from the information contained in the Scopus database (Elsevier B.V.). This shows the visibility of the journals contained in the Scopus database from 1996.
SCImago is a research group from the Consejo Superior de Investigaciones Científicas (CSIC), University of Granada, Extremadura, Carlos III (Madrid) and Alcalá de Henares, dedicated to information analysis, representation and retrieval by means of visualization techniques.