Web of Science (Science Citation Index Expanded) Bibliographic database for all scientific disciplines
Preprint-Server "arXiv" / Los Alamos National Laboratory Open access to scientific preprints
DBIS Datenbank-InfoSystem Cooperative service for the use of scientific databases
MathSciNet [AMS resource] "Mathematical Reviews" on the web - online version of the review journal - 1940 ff. International bibliographical database ed. by American Mathematical Society
zbMATH [formerly: Zentralblatt der Mathematik] Online version of the oldest review journal of Mathematics - 1931 ff.
