KENZHIN, Z. D.; 						KERIMKULOVA, A. B.; 						BIGALIEV, A. B..
 The principles of methods in determining level of bioindication of damaged ecosystems.
<strong>International Journal of Biology and Chemistry</strong>, [S.l.], n. 3, p. 43-47, june 2012.
ISSN 2409-370X.
Available at: &lt;<a href="https://ijbch.kaznu.kz/index.php/kaznu/article/view/51" target="_new">https://ijbch.kaznu.kz/index.php/kaznu/article/view/51</a>&gt;. Date accessed: 31 oct. 2020.