Hiromitsu Ogawa and Manato Ono and Naohiro Ban and Yoshihisa Ishida, Two Stage Control Method Using a Disturbance Observer and a Kalman Filter. journal = {International Journal of Electronics and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology. December 2009, vol. 36(12). 2265 - 2268 [viewed 20 September 2024]. Available from: https://publications.waset.org/pdf/5232.