by R. Andersson | .
by Konrad Mengel | .
by Konrad Mengal | .
by Romeo T.Toledo | .
by John M.Deman | .
by G. Haug | H. Hoffmann.
by Dora Godan | .
by Jose A. Campos-Ortega | Volker Hertenstein.
by J. M. G . Pieri | .
by Rajinder Peshin | .
by J . Kranz | .
by Heiko Diestel | .
by B.A.Stewart | .
by B. Rensch | .
by Johannes Piiper | .
by Edward A. Birge | .
by Karl Esser | Rudolf Kuenen.
by D. P. S. Verma | Th. Hohn.
by M. Tevini | H.K Lichtenthaler.
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