С., Кокомбаев К., and Тенирбердиев Н. К. “Influence of Anthropogenic Impact on Changes in Humus Content in Arable Soils”. Eurasian Journal of Ecology 63, no. 2 (June 25, 2020): 35–41. Accessed July 22, 2024. https://bulletin-ecology.kaznu.kz/index.php/1-eco/article/view/1033.