Feature extraction and pattern recognition of multi-source PD signals - Kai Gao; Kexiong Tan; Fuqi Li; Wensheng Gao (Proceedings of 2001 International Symposium on Electrical Insulating Materials (ISEIM 2001). 2001 Asian Conference on Electrical Insulating Diagnosis (ACEID 2001). 33rd Symposium on Electrical and Ele, Electrical Insulating Materials, 2001. (ISEIM 2001). Proceedings of 2001 International Symposium on, Electrical insulating materials, 2001)