1. D. W. Hayne, “An Examination of the Strip Census Methods for Estimating Animal Population,” J. Wildl. Manage 13, 145 (1949).
2. Yu. S. Ravkin, “Experience of Quantifying Birds in Forest Landscapes in the Winter and Spring Periods,” in Problems of Organization and Methods of Counting Vertebrates (Moscow, 1961), pp. 128–131 [in Russian].
3. Yu. S. Ravkin, “Bird Counts in Forest Landscapes,” in Nature of Centers of Tick-Borne Encephalitis in the Altai (Nauka, Siberian Branch, Novosibirsk, 1967), pp. 66–75 [in Russian].
4. Yu. S. Ravkin and S. G. Livanov, Factor Zoogeography (Nauka, Siberian Branch, Novosibirsk, 2008) [in Russian].
5. Yu. S. Ravkin, Birds of the Forest Zone of Priob’e (Nauka, Siberian Branch, Novosibirsk, 1978) [in Russian].