Nasonov, N. V. (1919). Contributions to the turbellarian fauna of Russia. I. Bulletin de l'Académie des Sciences de Russie. 6(12–18): 619-645. With two plates.
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Nasonov, N. V.
1919
Contributions to the turbellarian fauna of Russia. I
Bulletin de l'Académie des Sciences de Russie