I., 1971. Description of karyotypes of some species of birds of the USSR fauna. Proc. USSR Acad. Sci. 199: 1420–1423. Google Scholar Bulatova N. S., Radjabli S. I. & Panov E. N., 1972. Karyological description of three species of the genus Passer. Experientia 28: 1369–1371....
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