Publication
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A new and presumably now extinct species of Millepora (Hydrozoa) in the eastern Pacific Article
Zoologische Mededelingen, 65(20), 267-276.January 1991
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Reexamination of the holotype of Pseuderythrinus rosapinnis Hoedeman, 1950, a synonym of Hoplerythrinus unitaeniatus Agassiz, 1829 (Pisces, Characiformes, Erythrinidae) Article
Bulletin Zoologisch Museum, 13(5), 57-62.January 1991
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The marine and continental upper Miocene of Crevillente (Alicante, Spain) Article
Scripta Geologica, 1-8.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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Review Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 35(2), 346-346.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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Sporobolus (Gramineae) in Malesia Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 35(2), 393-458.January 1991
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Progress in Malesian botany Article
Flora Malesiana Bulletin, 10(4), 309-312.January 1991