Manakov, Andrei G., Natalya K. Terenina, and Bogdan A. Vladykin. “Dynamics of Ethno-Contact Zones in the Finno-Ugric Republics of the Urals and Volga Region in the Post-Soviet Period”. Proceedings of Voronezh State University. Series: Geography. Geoecology0, no. 4 (December 2, 2024): 60-70. Accessed December 5, 2025. https://journals.vsu.ru/geo/article/view/12699.