B. A. Vakhrushev, V. N. Dublyansky, G. N. Amelichev. "Karst of the Bzyb ridge. Western Caucasus". www.snowcave.ru (in Russian). Archived from the original on 2020-10-30. Retrieved 2019-05-11.. M .: Publishing house of RUDN, 2001.
web.archive.org
B. A. Vakhrushev, V. N. Dublyansky, G. N. Amelichev. "Karst of the Bzyb ridge. Western Caucasus". www.snowcave.ru (in Russian). Archived from the original on 2020-10-30. Retrieved 2019-05-11.. M .: Publishing house of RUDN, 2001.