TY  - BOOK
A1  - Baumgärtel, Hellmut
T1  - Group actions on C*-algebras and their description by Hilbert C*-extensions
T2  - Preprint / SFB 288, Differentialgeometrie und Quantenphysik
Y1  - 1999
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/21603
VL  - 385
CY  - Berlin
ER  -