Sang, T. T., Minh Thu, N., Hoang Khoi, T., Thi Kim Huong, N., Lan, L. T. N., & Van Thanh, N. (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