“Use of system approach for studying of the ecological situation of the city green space (on the example of «Chernyaevsky forest» of Perm)”, EJE, vol. 38, no. 2/2, Jan. 2016, Accessed: Jul. 20, 2026. [Online]. Available: https://bulletin-ecology.kaznu.kz/index.php/1-eco/article/view/244