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by Hary, Wilfried A.
by Kaltenstein, Jens
by Hundershagen, Karl Bernhard
by Büsch, Johann Georg
by Arnzen, Rudiger; Ullmann, Manfred
by D'Alembert, Jean Le Rond; Guro Verlag
by Vinogradov, A. G.
by Grimm, Benjamin Herbert
by Institut fur Bildungsforschung und Bildungsrecht; Institut fur Internationale Padagogische Forschung
by Herrmann, Wilhelm