Publication
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The age of beds in the Lettenkohle facies in South-East France (a palynological approach) Article
Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht, 360(1), 169-178.January 1971
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Het genus Calypogeia Raddi in Nederland Article
Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht, 363(1), 99-106.January 1971
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A revision of Dimocarpus (Sapindaceae) Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 19(1), 113-131.January 1971
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Dr. Hermann otto Sleumer retired Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 19(2), 199-210.January 1971
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Revision of Meliosma (Sabiaceae), section Lorenzanea excepted, living and fossil, geography and phylogeny Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 19(3), 355-529.January 1971
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Note on some more tropical labyrinth-seeds Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 19(1), 109-111.January 1971
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Review Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 19(1), 170-170.January 1971
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The systematic position of tribe Paropsieae, in particular the genus Ancistrothyrsus, and a key to the genera of Passifloraceae Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 19(1), 99-104.January 1971