Purev, D, J Bayarmaa, B Ganchimeg, B Ankhtsetseg, and O Anumandal. “Catalase, Protease and Urease Activity in Some Types of Soil”. Mongolian Journal of Chemistry 13 (September 17, 2014): 16–18. Accessed April 30, 2025. https://www.mongoliajol.info/index.php/MJC/article/view/153.