Directory of open access journals
www.doaj.org
Directory of journals in free access to full text of articles, more than 8000 journals; more than 4000 searchable to the article level.
PubMed Central
www.pubmedcentral.nih.gov
Main world digital archive for biomedicine.
ArXiv
http://arxiv.org
Open repository with 700.000 works in physics, mathematics, computer science and quantitative biology.
Cern Document Server
http://cdsweb.cern.ch
Repository with more than one million preprints, articles, books, journals and other documents in full text in physics and related disciplines.
Google Scholar
http://scholar.google.com/
Part of Google for search of scientific and professional publication and documents from great number of institutional and subject repositories.
DoiSerbia
http://www.doiserbia.nb.rs/
Serbian journals with DOI, searchable to the article level.
Serbian Citation Index
scindeks.ceon.rs
Database of national scientific journals. Beside basic bibliographic data, it is possible to see abstract and all citation references. Full texts are available for some articles.