Robust Low Pass Filter-PID Controller for 2-DOF Helicopter System. Iraqi Journal for Electrical and Electronic Engineering, [S. l.], v. 21, n. 1, p. 36–43, 2024. DOI: 10.37917/ijeee.21.1.4. Disponível em: https://ijeee.edu.iq/ijeee/article/view/4. Acesso em: 26 oct. 2025.