Saradatta, Thanaboon, and Pisut Pongchairerks. 2017. “A Time-Dependent ATSP With Time Window and Precedence Constraints in Air Travel”. Journal of Telecommunication, Electronic and Computer Engineering (JTEC) 9 (2-3):149-53. https://jtec.utem.edu.my/jtec/article/view/2345.