1. Yu. S. Ravkin, in Ornithology (Moscow, 1967), Issue 8, pp. 175–191 [in Russian].
2. Yu. S. Ravkin, Birds of the Northeastern Altai (Nauka, Siberian Branch, Novosibirsk, 1973) [in Russian].
3. I. V. Luk’yanova, in Problems of Zoogeography and History of Fauna (Novosibirsk, Nauka, Siberian Branch, 1980), pp. 255–273 [in Russian].
4. K. V. Grazhdan, K. V. Toropov, and U. Yu. Veryaskina, in The Fauna of the Altai-Sayan Mountain Territory (Gorno-Altaisk, 1999), pp. 43–50 [in Russian].
5. Yu. V. Drozdova, in Nature of the Foci of Tick-Borne Encephalitis in Altai (Nauka, Siberian Branch, Novosibirsk, 1967), pp. 21–30 [in Russian].