Chính. SURVEY RESULTS ON THE VERTICAL LANDING AERODYNAMIC CHARACTERISTICS OF THREE JOINTS HELICOPTER ROTOR AND DETERMINES THE VORTEX RING STATE. J. Mil. Sci. Technol. [Internet]. 2021 Apr. 12 [cited 2026 Mar. 12];(72):3-9. Available from: https://jmst.mod.gov.vn/index.php/jmst/article/view/73