Bagautdinova, Liya, Alexander Ryumin, Irina Kechaykina, and Serafim Chukov. “Transformation of Humic Acids of Buried Soils”. Biological Communications, no. 2 (May 25, 2012): 92–108. Accessed December 1, 2024. https://biocomm.spbu.ru/article/view/3851.