Ata, B., and R. Coban. “Artificial Bee Colony Algorithm Based Linear Quadratic Optimal Controller Design for a Nonlinear Inverted Pendulum”. International Journal of Intelligent Systems and Applications in Engineering, vol. 3, no. 1, Jan. 2015, pp. 1-6, https://ijisae.org/index.php/IJISAE/article/view/129.