Wang, Yaobin, Tao Zhang, and Pengpeng Hou. “Research on Super-Twisting Sliding Mode Voltage Regulation Control of Electric Spring”. International Journal of Mechanical and Electrical Engineering 2, no. 1 (February 23, 2024): 60–71. Accessed April 29, 2026. https://wepub.org/index.php/IJMEE/article/view/1145.