Template:Ostenfeld, 1903
- Ostenfeld, C.H. 1903. Phytoplankton from the sea around the Færöes. In: Botany of the Faeröes based upon Danish investigations. Part II. Illustrated with 2 plates (XI and XII), and 100 figures in the text. (Warming, E. Eds), pp. 558–612. Copenhagen: Det Nordisk Forlag Ernst Bojesen. BHL