Enlarged by an introduction of 24 pages. Revised habilitation - Fernuniversität, Hagen, 1992. "Die erst bis fünfte Auflage dieses Buches erschienen von 1996 bis 2011 im Verlag J.H.W. Dietz Nachf. GmbH, Bonn"--Title page verso. Includes bibliographical references (pages 663-698) and index.
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