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by Opitz, Otto; Klein, Robert; Etschberger, Stefan; et al.
by Opitz, Otto; Klein, Robert
by Opitz, Otto; Klein, Robert; Burkart, Wolfgang R.
by Classification Group of Sis Meeting (1997 Pescara, Italy); Vichi, Maurizio; Opitz, Otto
by Gaul, Wolfgang; Opitz, Otto; Schader, Martin; et al.
by Opitz, Otto; Rauhut, Burkhard
by Opitz, Otto
by Maurizio Vichi; ?Otto Opitz