SPATIAL DISTRIBUTION OF MARMOTA BAIBACINA AND M. SIBIRICA (MARMOTA, SCIURIDAE, RODENTIA) IN A ZONE OF SYMPATRY IN MONGOLIAN ALTAI: BIOACOUSTIC ANALYSIS Статья Brandler O.V., Nikol'sky A.A., Kolesnikov V.V. Biology Bulletin. Том 37. 2010. С. 321-325