H. Djojodihardjo and A. S. S. Ramli 2022. Modeling Studies of Bi- and Quad-Wing Flapping Ornithopter Kinematics and Aerodynamics. International Journal of Automotive and Mechanical Engineering. 9, (Dec. 2022), 1669–1684. DOI:https://doi.org/10.15282/ijame.9.2013.17.0139.