Tangka, Julius K., John Ngangsi Ngah, Godlove Suila Kuaban, and Mathias N. W. Evina. 2022. “Comparative Analysis of the Vibrational Response of Different Main Rotor Blades of a Homemade Helicopter”. European Journal of Applied Sciences 10 (4):460-73. https://doi.org/10.14738/aivp.104.12621.