Saradatta, T., and P. Pongchairerks. “A Time-Dependent ATSP With Time Window and Precedence Constraints in Air Travel”. Journal of Telecommunication, Electronic and Computer Engineering (JTEC), vol. 9, no. 2-3, June 2017, pp. 149-53, https://jtec.utem.edu.my/jtec/article/view/2345.