Publication
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Revision of the western Palaearctic Phanerotomini (Hymenoptera: Braconidae) Article
Zoologische Verhandelingen, 255(1), 1-106.January 1990
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A catalogue of the genera of the Vespidae (Hymenoptera) Article
Zoologische Verhandelingen, 260(1), 1-62.January 1990
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De verspreiding van het Grimmietum orbicularis (Allorge 1922) Marstaller 1980 in Nederland Article
Gorteria: tijdschrift voor de floristiek, de plantenoecologie en het vegetatie-onderzoek van Nederland, 16(4), 112-117.January 1990
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Parastenocarididae (Copepoda, Harpacticoida) from The Netherlands Article
Bijdragen tot de dierkunde, 60(3/4), 299-304.January 1990
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A collection of Thalassinidea, Anomura and Brachyura (Crustacea: Decapoda) from the Kimberley region of Northwestern Australia Article
Zoologische Verhandelingen, 265(1), 1-90.January 1990
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First records of the genus Pseudoniphargus (Amphipoda) from Gran Canaria, with description of a new species. Stygofauna of the Canary Islands, 17 Article
Bijdragen tot de dierkunde, 59(4), 229-238.January 1990
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A new combination in Agrostophyllum (Orchidaceae) Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 35(1), 165-165.January 1990
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Review Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 35(1), 166-166.January 1990