Shpynova, N. V., M. P. Sartakov, I. D. Komissarov, and I. V. Grekhova. “Comparative Characteristics of Thermal Stability of Humic Acids of Sapropels of the Middle Ob Region and South of OB-Irtysh Basin of Wstern Siberia”. Amazonia Investiga 7, no. 17 (December 27, 2018): 79–84. Accessed June 20, 2025. https://amazoniainvestiga.info/index.php/amazonia/article/view/330.