Ahmed Yousif Enad Al Baaj, Zoubeir Tourki. “LQR and PPM Control of Inverted Pendulum”. The International Journal of Multiphysics, vol. 18, no. 3, Sept. 2024, pp. 1121 -39, https://themultiphysicsjournal.com/index.php/ijm/article/view/1410.