Publication
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Notes sur les Orgeriini d'Espagne (Homoptera) Article
Zoologische Mededelingen, 35(1), 1-7.January 1957
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Parnassiana nova : XIII. Vier neue Hybriden Article
Zoologische Mededelingen, 35(5), 51-53.January 1957
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Notes on Rhizocephala of the genus Loxothylacus Article
Zoologische Mededelingen, 35(12), 153-160.January 1957
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Notes sur les mantides du Musée de Leyde avec la description d'un nouveau genre et de quelques espèces nouvelles Article
Zoologische Mededelingen, 35(6), 55-67.January 1957
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Parnassiana nova : XVI. Kritische Revision der Gattung Parnassius (Fortsetzung 11) Article
Zoologische Mededelingen, 35(18), 241-260.January 1957
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Notes on the collection of land-mollusca made by Dr. E . Jacobson on the Islands of Simalur and Babi in 1913, with descriptions of new species and races Article
Zoologische Mededelingen, 35(10), 125-138.January 1957
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Parnassiana nova : XIV. Kritische Revision der Gattung Parnassius (Fortsetzung 9) Article
Zoologische Mededelingen, 35(8), 79-111.January 1957
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Miscellaneous botanical Notes VIII Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 8(2), 514-517.January 1957