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by Lukas Bäuerle; Stephan Pühringer; Walter Otto Ötsch
by Ötsch, Walter-Otto; Graupe, Silja
by Walter Otto Ötsch; ?Silja Graupe
by Ötsch, Walter Otto; Pu¨hringer, Stephan; Hirte, Katrin
by Fridrich, Christian; Hedtke, Reinhold; Ötsch, Walter-Otto
by Walter Otto Ötsch; Stephan Pühringer; Katrin Hirte
by Christian Fridrich; ?Reinhold Hedtke; ?Walter Otto Ötsch