Hat mitgewirkt an:
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Cypripediaceae, Orchidaceae : Orchidoideae, Tropidioideae, Spiranthoideae, Vanilloideae, Epidendroideae p.p.
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Taxonomy of Cyrtochilum-alliance (Orchidaceae) in the light of molecular and morphological data
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Orchidaceae of West-Central Africa, Vol. 3.. Vandoideae (continued)
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Orchidaceae of West-Central Africa, Vol. 2.. Epidendroideae, Vandoideae (in part)