Chính. “SURVEY RESULTS ON THE VERTICAL LANDING AERODYNAMIC CHARACTERISTICS OF THREE JOINTS HELICOPTER ROTOR AND DETERMINES THE VORTEX RING STATE”. Journal of Military Science and Technology, no. 72 (April 12, 2021): 3–9. Accessed November 25, 2024. https://ojs.jmst.info/index.php/jmst/article/view/73.