Stable Vertical Takeoff of an Insect-Mimicking Flapping-Wing System Without Guide Implementing Inherent Pitching StabilityPhan, Hoang Vu; Nguyen, Quoc Viet; Truong, Quang Tri; Van Truong, Tien; Park, Hoon Cheol; Goo, Nam Seo; Byun, Doyoung; Kim, Min Jun · Journal of Bionic Engineering · 2012