Directional calibration of rogowski coil for localization of partial discharges in smart distribution networksShafiq, Muhammad; Kütt, Lauri; Isa, M.; Hashmi, M.; Lehtonen, MattiInternational review of electrical engineering2012 / p. 5881-5890 https://www.researchgate.net/publication/262703688_Directional_Calibration_of_Rogowski_Coil_for_Localization_of_Partial_Discharges_in_Smart_Distribution_Networks