Vardakis, G. E., M. Danikas, and A. Nterekas. 2020. “Partial Discharges in Cavities and Their Connection With Dipoles, Space Charges, and Some Phenomena Below Inception Voltage”. Engineering, Technology & Applied Science Research 10 (4). Greece:5869-74. https://doi.org/10.48084/etasr.3593.