KOTELNIKOV, Valeriy I.; KULIKOVA, Marina P.; PRUDNIKOV, Sergey G. The history of coal studies and coal industry in Tuva. The New Research of Tuva, [S. l.], n. 2, p. 225–240, 2020. DOI: 10.25178/nit.2020.2.16. Disponível em: https://nit.tuva.asia/nit/article/view/934. Acesso em: 3 mar. 2026.