Ha Dinh Nghiem*, Nguyen Thi Hue, Nguyen Thanh Hai 2016. A study of the ability to absorb heavy metals lead and arsenic of fern (Microsorum pteropus) and cold (Bidens pilosa L) in Bac Kan. The University of Danang - Journal of Science and Technology. 9, 106 (Sep. 2016), 87–90.