Федоренко, Р.М., and В.М. Казак. “Improvement of Program-Goal Method in Defence Planning System”. Proceedings of National Aviation University (archive) 23, no. 1 (January 1, 2005): 219–225. Accessed April 17, 2026. http://jrnl.kai.edu.ua/index.php/visnik/article/view/1105.