Nasution, Darmeli, Herman Mawengkang, Fahmi, and Muhammad Zarlis. “Mathematical Model for Optimization in Air Traffic Scheduling Management During the COVID-19 Pandemic”. Eastern-European Journal of Enterprise Technologies 6, no. 3 (126) (December 28, 2023): 18–26. Accessed July 27, 2024. https://journals.uran.ua/eejet/article/view/293514.