por Phytochemical Society Of North America Meeting (29 : 1989 : Vancouver, R. C.) | Towers, G. H. Neil [editor] | Stafford, Helen A, 1922- [editor].
por Phytochemical Society Of North America. Meeting (30 : 1990 : Laval University) | Fisher, Nikolaus H [editor] | Isman, Murray B [editor] | Stafford, Helen A [editor].
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