by Dregne, H.E | .
by Barkai-Golan, Rivka | .
by Gardner , Bruce L | .
by P. F. Fox | .
by G.S Campbell | .
by Abul K.Abbas | .
by Petra Marschner | .
by Abul K Abbas | .
by Dilip K Arora | .
by Roger Hull | .
by Hans -Walter Heldt | .
by Jan-Ake Gustafsson | .
by Alex G. Alexander | .
by Charles Delisi | .
by U.Satyanarayana | .
by A. Maton | J. Daelemans J. Lambrecht.
by H. Hengeveld | .
by D.E.C. Corbridge | .
by A.W. Robards | .
by Wilhelm Prodinger | Stewart Holmes.
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