Okada, Tokuji, Akihiro Tsuchida, Tomofuni Mukaiyachi, and Toshimi Shimizu. “Development of a Stabilized Wideband Pendulum-Type Gravity Direction Sensor Utilizing an Electromagnetic Clutch and Brake for Anti-Swing”. Journal of Automation, Mobile Robotics and Intelligent Systems 2, no. 4 (November 22, 2008): 45–51. Accessed April 30, 2025. https://www.jamris.org/index.php/JAMRIS/article/view/618.