Design of an Optimal Integral Backstepping Controller for a Quadcopter. Journal of Engineering, [S. l.], v. 24, n. 5, p. 46–65, 2018. DOI: 10.31026/j.eng.2018.05.04. Disponível em: https://joe.uobaghdad.edu.iq/index.php/main/article/view/584. Acesso em: 16 apr. 2025.