Rigid-body modeling and nonlinear state estimation of an X-configuration quadrotor UAV based on the AscTec hummingbird platform. Nat. App. Sci. Int. J. [Internet]. 2026 Sep. 15 [cited 2026 Sep. 18];7(1):140-65. Available from: https://ideapublishers.org/index.php/nasij/article/view/7.1.8