Kenzhin, Z. D., A. B. Kerimkulova, and A. B. Bigaliev. “The Principles of Methods in Determining Level of Bioindication of Damaged Ecosystems”. International Journal of Biology and Chemistry, no. 3 (June 20, 2012): 43–47. Accessed April 18, 2024. https://ijbch.kaznu.kz/index.php/kaznu/article/view/51.