Internet, http://www.uni-bielefeld.de/ZIF/index.html, 2012-07-06
Mathematical methods in physics : distributions, Hilbert space.../ Philippe Blanchard,
Erwin Brüning.- Birkhäuser, cop. 2003
Information trouvée : University of Bielefeld, Faculty of Physics, Germany
http://authorities.loc.gov/cgi-bin/Pwebrecon.cgi?DB=local&PAGE=First.