1
by Hennen, Leonhard, Grünwald, Reinhard, Revermann, Christoph, Sauter, Arnold
Published 2008
Nomos Verlagsgesellschaft mbH & Co. KG

2
by Grunwald, Armin, Banse, Gerhard, Coenen, Christopher, Hennen, Leonhard
Published 2005
Nomos Verlagsgesellschaft mbH & Co. KG