Eleshev, R., Z. Bakenova, and E. Krzywy. “Application of Fertilizers and Change of Enzymatic Activity of Soils”. Eurasian Chemico-Technological Journal 14, no. 1 (February 15, 2012): 97–101. Accessed March 29, 2024. https://ect-journal.kz/index.php/ectj/article/view/361.