Publication
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Potentilla (Rosaceae) in New Guinea: Census, key, and some new taxa Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 34(1), 143-160.January 1989
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Two novelties in the genus Trias Lindl. (Orchidaceae) Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 34(1), 103-109.January 1989
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Skin, skull and skeleton characters of mouse deer (Mammalia, Tragulidae), with keys to the species Article
Bulletin Zoologisch Museum, 12(5), 89-96.January 1989
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De eerste FLORON-werkweek te Groesbeek, 22—28 juli 1989 Article
Gorteria: tijdschrift voor de floristiek, de plantenoecologie en het vegetatie-onderzoek van Nederland, 15(5), 149-154.January 1989
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Neue marine Cyclopoida Gnathostoma (Crustacea, Copepoda) von Puerto Rico. Amsterdam Expeditions to the West Indian Islands, Report 57 Article
Bijdragen tot de dierkunde, 59(1), 43-61.January 1989
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Large flora treatments and monographic studies. Where are the boundaries? Does the system – one specialist for many floras – work well? Article
Flora Malesiana Bulletin, 10(1), 21-25.January 1989
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Voorlopig excursieprogramma 1990 Article
Gorteria: tijdschrift voor de floristiek, de plantenoecologie en het vegetatie-onderzoek van Nederland, 15(6), 180-180.January 1989
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Australopyrum, Brachypodium, and Elymus (Gramineae) in Malesia Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 34(1), 61-76.January 1989