Sang, Thai Thanh, Nguyen Minh Thu, Truong Hoang Khoi, Nguyen Thi Kim Huong, Le Thi Ngoc Lan, and Nguyen Van Thanh. 2021. “The Optimization of Transportation Costs in Logistics Enterprises During the Covid-19 Pandemic”. ARRUS Journal of Mathematics and Applied Science 1 (2):62-71. https://doi.org/10.35877/mathscience567.