Air-core sensors operation modes for partial discharge detection and on-line diagnostics in medium voltage networksKütt, Lauri; Shafiq, Muhammad; Mõlder, Heigo; Järvik, Jaan; Lehtonen, MattiScientific Journal of Riga Technical University. Electrical, control and communication engineering2013 / p. 5-12 : ill

Comparison of operating modes of air-core inductive sensors for partial discharge on-line diagnostics in medium voltage networksKütt, Lauri; Shafiq, Muhammad; Lehtonen, Matti; Mõlder, Heigo; Järvik, JaanDigest book and electronic proceedings : 54th International Scientific Conference of Riga Technical University : Section of Power and Electrical Engineering2013 / p. 29.1-29.6 : ill

Power quality issues in dispersed generation and smart gridsVaimann, Toomas; Niitsoo, Jaan; Kivipõld, Tanel; Lehtla, TõnuElektronika ir elektrotechnika = Electronics and electrical engineering2012 / p. 23-26 : ill https://citeseerx.ist.psu.edu/document?repid=rep1&type=pdf&doi=573c03a0753bcfce3929ba739ff032b16882acf5