Publication
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Species boundaries in non-tropical Northern Hemisphere Owls Article
Bijdragen tot de dierkunde, 60(3/4), 163-170.January 1990
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Excursie IJsselakademie Article
Gorteria: tijdschrift voor de floristiek, de plantenoecologie en het vegetatie-onderzoek van Nederland, 16(3), 90-90.January 1990
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Revision of the Euagathis species (Hymenoptera: Braconidae) from Sulawesi Article
Zoologische Verhandelingen, 256(1), 1-35.January 1990
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Systematics and zoogeography of Asteroidea (Echinodermata) from Inhaca Island, Mozambique Article
Zoologische Verhandelingen, 261(1), 1-86.January 1990
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Notes on Mucorales—I. Observations on Absidia Article
Persoonia - Molecular Phylogeny and Evolution of Fungi, 14(2), 133-149.January 1990
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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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The Oecetis reticulata species-group from the South-West Pacific area (Trichoptera: Leptoceridae) Article
Bijdragen tot de dierkunde, 59(4), 191-202.January 1990
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A catalogue of the genera of the Vespidae (Hymenoptera) Article
Zoologische Verhandelingen, 260(1), 1-62.January 1990