1. Humphry Davy “VII. Additional Experiments on Galvanic Electricity”, Journal of Natural Philosophy, Chemistry, and the Arts (Nicholson's Journal) , London, Vol.IV, October 1800, 326-328
2. Sir Humphry Davy Elements of Chemical Philosophy: Part 1 Vol.1 (London: J. Johnson and Co., St Paul's Church Yard, 1812), p.85 and Plate III, Fig.18. https://archive.org/details/elementschemica00davygoog
3. English patents, No. 4208 of 1878 and No. 2110 of 1879
4. R.T. Jones T.R. Curr “Pyrometallurgy at Mintek”, Southern African Pyrometallurgy 2006 , Edited by R.T. Jones, SAIMM, Johannesburg, 5-8 March 2006, pp.127-150. http://www.mintek.co.za/Pyromet/Files/2006JonesMintek.pdf
5. R.T. Jones T.R. Curr N.A. Barcza “Developments in Plasma Furnace Technology”, High-Intensity Pyrometallurgy , The Institution of Mining and Metallurgy, 4 February 1993, London. http://www.mintek.co.za/Pyromet/Files/PlasmaDev.pdf