Kütt, L., Shafiq, M., Lehtonen, M., Mõlder, H., & Järvik, J. (2013). Air-Core Sensors Operation Modes for Partial Discharge Detection and On-line Diagnostics in Medium Voltage Networks. Electrical, Control and Communication Engineering, 4(1), 5-12. https://doi.org/10.2478/ecce-2013-0015