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by Book, Matthias; Gruhn, Volker; Striemer, Rüdiger
by Matthias Book; Volker Gruhn; Rüdiger Striemer
by Crnkovic, Ivica; Gruhn, Volker; Book, Matthias
by Gschwind, Thomas; De Paoli, Flavio; Gruhn, Volker; et al.
by Ivica Crnkovic; ?Volker Gruhn; ?Matthias Book