Produced by Institute for Scientific Information (ISI), since 1991. Web of Science  has multidisciplinary content that covers over 10,000 of the highest impact journals worldwide, including Open Access journals and over 110,000 conference proceedings.

Scopus is  a citation and abstracting database published by Elsevier, covering more than 18,000 journals (16,500 peer reviewed). All records published since 1996. contain cited references. Article records go back as far as 1893. Scopus is searchable through Scopus or SciVerse interface.

Current Contents (Thomson Reuters) is the most popular database in Croatia, available to Croatian scientists through Ovid interface. The reasons for its popularity are: high criteria by which selected journals are included, covers a broad range of scientific fields, database is regularly updated. Current Contents contain author-written abstracts, author's address, publisher's address and outstanding searching and browsing possibilities.