Thien, H. P., T. Mulyanto, H. Muhammad, and S. Suzuki. “DEVELOPMENT OF COAXIAL ROTOR MICRO UNMANNED AERIAL VEHICLE”. Mesin, vol. 24, no. 2, May 2017, pp. 100-27, https://journals.itb.ac.id/index.php/jtms/article/view/4993.