A. El-Sherbeny, Nasser. 2016. “Difference of Convex Functions Optimization Methods: Algorithm of Minimum Maximal Network Flow Problem With Time-Windows”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 25 (1):67-81. https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/4774.