Publication
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Respect voor de natuur in het overheidsbeleid Article
Gorteria: tijdschrift voor de floristiek, de plantenoecologie en het vegetatie-onderzoek van Nederland, 17(3/4), 43-51.January 1991
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Papuacalia (Compositae). A new genus for the woody Senecios of New Guinea Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 36(1), 165-178.January 1991
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Expeditions and other fieldwork Article
Flora Malesiana Bulletin, 10(4), 313-315.January 1991
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Notes on Southeast Asian and Australian Coreopsidinae (Asteraceae) Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 35(2), 459-482.January 1991
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Books received by the Rijksherbarium library Article
Persoonia - Molecular Phylogeny and Evolution of Fungi, 14(3), 347-352.January 1991
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The PROSEA project (Plant Resources of Southeast Asia) Article
Flora Malesiana Bulletin, 10(4), 343-344.January 1991
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Coralliomyzontidae, Fam. n. (Copepoda: Siphonostomatoida), associated with Scleractinian corals in Madagascar Article
Bulletin Zoologisch Museum, 13(3), 17-24.January 1991
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Revision of the genera of the Afrotropical and W. Palaearctic Rogadinae Foerster (Hymenoptera: Braconidae) Article
Zoologische Verhandelingen, 273(1), 1-101.January 1991