1. https://images.search.yahoo.com/search/images
2. https://www.yourelectricalguide.com/2017/03/induction-heating-induction-furnace.html
3. http://infohouse.p2ric.org/ref/10/09048.pdf
4. World Steel Association, World Steel in Figures (2019)
5. F.P. Edneral, Electrometallurgy of Steel and Ferro-alloys (MIR Publishers, Moscow, 1979)