Butlerius gagarini Tsalolikhin 1980

Tsalolikhin 1980. [Review of the genus Butlerius Goodey, 1929 (Nematoda, Diplogasteridae).] Vinberg, G.G.[Ed]. Trophic relations of fresh water invertebrates., Akademiya Nauk SSSR, Leningrad, 1980: 147-155. Chapter pagination: 147-155