Dedicated to the 80th anniversary of the doctor of biological sciences, academician of the Academy of Ecology, professor Mamutov Zheken Umbetkulovich. JGEM [Internet]. 2019 Aug. 13 [cited 2026 Jul. 22];53(2):67-8. Available from: https://bulletin-geography.kaznu.kz/index.php/1-geo/article/view/797