Publication
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Lower Palaeozoic erratic favositids from the Island of Sylt, Germany Article
Scripta Geologica, 1-32.January 1991
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Colonization of the German part of the river Rhine by the Asiatic clam, Corbicula fluminea Müller, 1774 (Pelecypoda, Corbiculidae) Article
Bulletin Zoologisch Museum, 13(2), 13-16.January 1991
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Hormaphidinae from Java (Homoptera: Aphididae) Article
Zoologische Verhandelingen, 270(1), 1-525.January 1991
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New observations on scleractinian corals from Indonesia: 3. Species belonging to the Merulinidae with new records of Merulina and Boninastrea Article
Zoologische Mededelingen, 65(26), 333-342.January 1991
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Miscellaneous notes on Southeast Asian Gramineae. VI Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 36(1), 179-181.January 1991
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Quelques Philopotamides orientaux nouveaux ou peu connus (Trichoptera, Annulipalpia) Article
Beaufortia, 42(4), 89-107.January 1991
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Review Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 36(1), 160-160.January 1991
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Review Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 36(1), 122-122.January 1991