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by Bernd Scheed; Petra Scherer
by Krauthausen, Günter; Scherer, Petra
by Biehler, Rolf; Lange, Thomas; Leuders, Timo; et al.
by Scheed, Bernd; Scherer, Petra
by Scherer, Petra; Moser Opitz, Elisabeth; Padberg, Friedhelm
by Krauthausen, Gunter; Scherer, Petra; Padberg, Friedhelm
by Petra Scherer; Elisabeth Moser Opitz