Nguyen, T., Z. Wen-Hui, and Y. Jian-Jun. “RESEARCH ON HO CHI MINH CITY CONGESTION PRICING BASEDON SPEED-DENSITY MODEL”. Science and Technology Development Journal, Vol. 17, no. 3, Sept. 2014, pp. 129-3, doi:https://doi.org/10.32508/stdj.v17i3.1524.