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by Hedtke; Reinhold
by Hedtke, Reinhold
by Engartner, Tim; Fridrich, Christian; Graupe, Silja; et al.
by Fridrich, Christian; Hedtke, Reinhold; Tafner, Georg
by Fridrich, Christian; Hedtke, Reinhold; Ötsch, Walter-Otto
by Reinhold Hedtke
by Christian Fridrich; ?Reinhold Hedtke; ?Walter Otto Ötsch