Шон Лe Тхе, and А. Н. Клипа. “Identification of Helicopter Mass Flexibility Characteristics”. Proceedings of National Aviation University 3, no. 2 (September 26, 1999): 77–82. Accessed November 25, 2024. https://jrnl.nau.edu.ua/index.php/visnik/article/view/9375.