Sihaliev, Samil' Sihalievic. “BRIEF INFORMATION ABOUT CONTACTS BETWEEN MUSLIMS OF DAGESTAN AND THE VOLGA-URAL REGION IN THE XVIII-XX CENTURIES”. History, Archeology and Ethnography of the Caucasus, vol. 16, no. 1, Apr. 2020, pp. 104-28, https://doi.org/10.32653/CH161104-128.