Design of a Non Fragile Optimal Control Based Realization in Comparison between LQR and Observer Based Controller for Magnetic Levitation System. International Journal of Information Technology and Computer Engineering, [S. l.], v. 4, n. 3, p. 1–4, 2016. Disponível em: https://ijitce.org/index.php/ijitce/article/view/32. Acesso em: 24 jan. 2026.