SARTAKOV, M. P.; CHUMAK V. A., V. A.; GREKHOVA, I. V.; EFANOV, M. V. The study of the chemical composition of humic acids of initial and heat-treated sapropels of lakes of the Surgut district of the Khanty-Mansi autonomous Okrug – Yugra. Amazonia Investiga, [S. l.], v. 7, n. 17, p. 72–78, 2018. Disponível em: https://amazoniainvestiga.info/index.php/amazonia/article/view/328. Acesso em: 3 jul. 2024.