PubMed comprises more than 21 million citations for biomedical literature from MEDLINE, life science journals, and online books
Web of Science: (Bharathidasan University)
Web of Science provides researchers, administrators, faculty, and students with quick, powerful access to the world's leading citation databases. Authoritative, multidisciplinary content covers over 10,000 of the highest impact journals worldwide, including Open Access journals and over 110,000 conference proceedings.
Scopus (Bharathidasan University)
Scopus launched in November 2004, is the largest abstract and citation database containing both peer-reviewed research literature and quality web sources. With over 19,000 titles from more than 5,000 international publishers, SciVerse Scopus offers researchers a quick, easy and comprehensive resource to support their research needs in the scientific, technical, medical and social sciences fields and, more recently, also in the arts and humanities.