PATI, A.; PAL, V. C.; NEGI, R. Design of a 2-DOF Control and Disturbance Estimator for a Magnetic Levitation System. Engineering, Technology & Applied Science Research, Greece, v. 7, n. 1, p. 1369–1376, 2017. DOI: 10.48084/etasr.986. Disponível em: https://etasr.com/index.php/ETASR/article/view/986. Acesso em: 28 sep. 2021.