Ayad Al-Mahturi and  Herman Wahid,  Optimal Tuning of Linear Quadratic Regulator Controller Using a Particle Swarm Optimization for Two-Rotor Aerodynamical System.   journal   = {International Journal of Electronics and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2017, vol. 122(2). 196 - 202
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/10006444.