Nguyen Van Khanh and Bui Thi Nhu Quynh (2017) “ A STUDY OF TOXICITY OF KALI DICROMAT IN AZOLLA CAROLINIANA WILLD., 1810”, UED Journal of Social Sciences, Humanities and Education, 7(3), pp. 6-12. doi: 10.47393/jshe.v7i3.780.