|ResearchBib - a scientometric base of open access publications (Japan)|
|Index Copernicus International - international scientometric base (Poland)|
|Academia - an international scientometric base (USA)|
|Vernadsky National Library - the library of Ukrainian National Academy of Sciences.
|Directory of Open Access Scholarly Resources (ROAD) is a service developed by the ISSN Internation Centre in cooperation with UNESCO Communication and Information sector. ROAD offers free access to ISSN Registry segment.|