[1]Khiem, L.H. et al. 2019. The Study of Air Pollution of Metal Elements in Hanoi, Hung Yen and Dong Nai Using Barbula Indica Moss. <i>Communications in Physics</i>. 29, 3SI (Oct. 2019), 401. DOI:https://doi.org/10.15625/0868-3166/29/3SI/14329.