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by Hahn, Helmut
by Aschenbach, Bernd; Trumper, Joachim; Hahn, Hermann-Michael; et al.
by Suerbaum, Sebastian; Hahn, Helmut; Burchard, Gerd-Dieter; et al.
by Adam, Dieter; Hahn, Helmut; Opferkuch, Wolfgang
by Klaus Miksits; Helmut Hahn
by Helmut Hahn; ?Stefan H. E. Kaufmann; ?Thomas F. Schulz