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by Blumhardt, Christoph Friedrich; Bittner, Wolfgang J.; Rhenius, Ruth; et al.
by Willi-Hans Steeb; Wolfgang Mathis
by Clausert, H.; Hoffmann, Karl; Mathis, Wolfgang; et al.
by Mathis, Wolfgang; Reibiger, Albrecht
by Kyamakya, Kyandoghere; Halang, Wolfgang A.; Mathis, Wolfgang; et al.
by Kyamakya, Kyandoghere; Mathis, Wolfgang; Stoop, Ruedi; et al.
by Wolfgang Mathis; Albrecht Reibiger
by H. Clausert; Karl Hoffmann; Wolfgang Mathis; et al.