Anh, T. T. T. A., and N. V. Quyen. 2020. “Optimal Speed Profile Determination With Fixed Trip Time in the Electric Train Operation of the Cat Linh-Ha Dong Metro Line Based on Pontryagin’s Maximum Principle”. Engineering, Technology & Applied Science Research 10 (6). Greece:6488-93. https://doi.org/10.48084/etasr.3856.