Load adapting mains frequency resonant converters for supplying electrical arc - a new way in power electronicsJanson, Kuno; Järvik, JaanPESC '98 : Record of the 29th Annual IEEE Power Electronics Specialists Conference, Fukuoka, Japan, May 17-22, 1998. Vol. 21998 / p. 2090-2096: ill https://ieeexplore.ieee.org/document/703468