1992 General
Authors: Gijsman, A.J.
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1992 Colombia
Authors: Rodriguez Fernández, C.A.
1991 Colombia
Authors: Galeano, G.
1991 Indonesia
Authors: Kebler, P.J.A. and Sidiyasa, K.
1990 Colombia
Authors: Dominguez, C., Gomez, A. 1990
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