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by Volpers, Helmut, Salwiczek, Christian, Schnier, Detlef
Published 2000
Published 2000
VS Verlag für Sozialwissenschaften
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by Schulz, Gerhard, Guder, Hermann, Janzen, Franz, Potthast, Gerhard
Published 1984
Published 1984
Vieweg+Teubner Verlag