Portals
ViFa-Math: the Virtuelle Fachbibliothek Mathematik (Virtual Specialist Library for Mathematics) aims to facilitate research for information related to mathematics. Here, you can search for conventional media and electronic resources.
TIB-Portal: is the portal for specialist and research data for technical life science subjects. I
Networks and Central Libraries
KVK: The Karlsruher Virtuelle Katalog (Karlsruhe Virtual Catalog) allows for parallel searches in several catalogs at once, as well as in bookstore directories, for example. Currently, it can direct you to approximately 100 million books and journal titles worldwide.
HBZ: the Hochschulbibliothekszentr