Abdelmoula Saggai, Samir Zeghlache, Loutfi Benyettou, Ali Djerioui. “Fault Tolerant Control Based on Sliding Mode Observer and Adaptive Type-2 Fuzzy Back Stepping Control of Octorotor Aircraft ”. International Journal of Advanced Science and Technology, Vol. 29, no. 05, Oct. 2020, pp. 14127 -53, http://sersc.org/journals/index.php/IJAST/article/view/33212.