1. A revision of the rotatorian genera Brachionus and Platyias, with descriptions of one new species and two new varieties;Ahlstrom E. H.;Bull. Amer. Mus. nat. Hist.,1940
2. A revision of the rotatorian genus Keratella with descriptions of three new species and five new varieties;Ahlstrom E. H.;Bull. Amer. Mus. nat. Hist.,1943
3. Scientific results of the Cambridge Expedition to the East African Lakes, 1930-1.-6. Rotifères et Gastrotriches.
4. Nomenklatorische Bemerkungen an einigen planktischen Rotatorien-Arten aus der Gattung Keratella
5. Taxonomie und Verbreitung von Keratella valga und verwandten Formen;Berzins B.;Ark. Zool. (2),1955