·   Zentralblatt für Mathematik

·   MathSciNet (Mathematical Reviews)

·   SCOPUS

·   ISI Alerting Service

·   Science Citation Index-Expanded (SCIE) including the Web of Science

·   Current Contents/Physical, Chemical & Earth Sciences

·   Open-J-Gate

·   Directory of Open Access Journals

·    EMIS ELibM

·   Intute

·   Current Mathematical Publications

·   Academic keys

·   EBSCO Publishing

·   Scirus

·   Wikipedia

·   Digital Mathematics Registry

·   Cambridge Scientific Abstracts

·   WWW Virtual Library

·   Ulrich's Periodicals Directory

·   JournalSeek

·   Google Scholar