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by Edited by Walter Carl Hartwig
by Zimmermann, Manfred; Bischof, Hartwig (CON); Zahlten, Johannes (CON); et al.
by Walter Hartwig
by Hartwig, Walter
by Walter C. Hartwig
by Gestring, Norbert; Heine, Hartwig; Mautz, Rudiger; et al.
by Hartwig, Dirk; Homolka, Walter; Marx, Michael J.; et al.