N. A. El-Sherbeny, “Difference of Convex Functions Optimization Methods: Algorithm of Minimum Maximal Network Flow Problem with Time-Windows”, IJSBAR, vol. 25, no. 1, pp. 67–81, Jan. 2016, Accessed: Sep. 15, 2025. [Online]. Available: https://www.gssrr.org/JournalOfBasicAndApplied/article/view/4774