Hasegawa, Tomohiko. “Production of a Tilt Rotor System and a Speed Control of a DC Motor for Quadrotors”. International Journal on Smart Material and Mechatronics 4, no. 1 (April 20, 2017): 278–281. Accessed August 27, 2025. https://ijsmm.id/index.php/ijsmm/article/view/38.