Lodygin, Evgeny, and Roman Vasilevich. “Molecular-Mass Distribution of Humic Substances from Arctic Soils According to Size Exclusion Chromatography”. Polish Polar Research 41, no. 4 (November 24, 2020): 271–287. Accessed September 1, 2026. https://wydawnictwo.pan.pl/index.php/ppr/article/view/3036.