History of development of coal chemical research in Tuva. The New Research of Tuva, [S. l.], n. 1, p. 91–101, 2025. DOI: 10.25178/nit.2025.1.7. Disponível em: https://nit.tuva.asia/nit/article/view/1443. Acesso em: 2 jan. 2026.