Мелкумян, В. Г., and А. А. Семенов. “Some Problems of Expert Estimations of Approbation Results of Civil Aviation Normative and Guiding Documentation”. Proceedings of National Aviation University (archive) 2, no. 1 (May 12, 1999): 255–259. Accessed October 10, 2026. https://jrnl.kai.edu.ua/index.php/visnik/article/view/9000.