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by Rittberger, Volker
by Andreas Hasenclever , Peter Mayer , Volker Rittberger
by Rittberger, Volker; Nettesheim, Martin
by Rittberger, Volker; Zangl, Bernhard; Kruck, Andreas
by Rittberger, Volker; Mayer, Peter
by Rittberger, Volker; Zangl, Bernhard; Kruck, Andreas; et al.
by Edited by Volker Rittberger
by Volker Rittberger; Bernhard Zangl; Andreas Kruck; et al.