Shpynova, N. V.; Sartakov, M. P.; Komissarov, I. D.; Grekhova, I. V. Comparative Characteristics of Thermal Stability of Humic Acids of Sapropels of the Middle Ob Region and South of OB-Irtysh Basin of Wstern Siberia. AmazInv 2018, 7, 79-84.