by Ernst Grell | .
by T.Sharma | .
by Robert F.Sehleif | .
by Jurgen Schulz-Schaeffer | .
by Robert S.De Santo | .
by H.Ursprung | .
by F.Leslie Hart | .
by G.E. Schulz | R.H. Schirmer.
by Edward Batschelet | .
by R. Andersson | .
by T.K. Ghose | .
by Dora Godan | .
by Jose A. Campos-Ortega | Volker Hertenstein.
by J. M. G . Pieri | .
by J . Kranz | .
by Heiko Diestel | .
by B.A.Stewart | .
by B. Rensch | .
by J. H. Schroder | .
by D. P. S. Verma | Th. Hohn.
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