Котляров, В. П., А. Н. Косогов, and М. М. Потемкин. “Optimization of Cargo Delivery by Aeroplanes”. Proceedings of National Aviation University (archive) 1, no. 1 (January 30, 1998): 322–324. Accessed June 14, 2026. http://jrnl.kai.edu.ua/index.php/visnik/article/view/10986.