Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) T. Okano and M. Kawakami and Isamu Kitani and S. Nishimoto and K. Arii and M. Mukai,Degradation diagnosis of solid insulation using sound waves emitted by partial discharge,Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM),,IEEE,2002-12-17,2,,614-617,https://cir.nii.ac.jp/crid/1871146592979663360,https://doi.org/10.1109/icpadm.1994.414085