Ha, Vo Thi Le, et al. “PM2.5-Bound PAHs in the Indoor and Outdoor Air of Nursery Schools in Ha Noi, Viet Nam and Health Implication”. <i>Vietnam Journal of Science and Technology</i>, vol. 58, no. 3, May 2020, pp. 319-27, doi:10.15625/2525-2518/58/3/14224.