Ostenfeld, C. H. (1908). On the immigration of Biddulphia sinensis Grev. and its occurrence in the North Sea during 1903-1907 and on its use for the study of the direction and rate of flow of the currents. Meddelelser fra Kommissionen for Danmarks Fiskeri-Og Havundersøgelser. Serie: Plankton (København). 1(6): 1-44.
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Ostenfeld, C. H.
1908
On the immigration of Biddulphia sinensis Grev. and its occurrence in the North Sea during 1903-1907 and on its use for the study of the direction and rate of flow of the currents
Meddelelser fra Kommissionen for Danmarks Fiskeri-Og Havundersøgelser. Serie: Plankton (København)