Guo, Xiwen, Xianda Liao, Qunjing Wang, Yan Wen, and Tao Wu. “Designing Active Disturbance Rejection Control of Permanent Magnetic Spherical Actuator Based on Nonlinear Extended State Observer”. Elektronika ir Elektrotechnika 28, no. 1 (February 24, 2022): 23-31. Accessed May 2, 2024. https://eejournal.ktu.lt/index.php/elt/article/view/30102.