Yan Lu*, Peijiang Li, Xiaoyi Zheng. “State Evaluation of SF6 High Voltage Circuit Breaker Based on Improved Radar Chart and Catastrophe Progression Method”. Design Engineering (October 31, 2020): 782 - 794. Accessed July 3, 2024. http://thedesignengineering.com/index.php/DE/article/view/857.