KENZHIN, Z. D.; KERIMKULOVA, A. B.; BIGALIEV, A. B..
The principles of methods in determining level of bioindication of damaged ecosystems.
International Journal of Biology and Chemistry, [S.l.], n. 3, p. 43-47, june 2012.
ISSN 2409-370X.
Available at: <https://ijbch.kaznu.kz/index.php/kaznu/article/view/51>. Date accessed: 19 jan. 2021.