1. Birkeland and Eyde, Electrotechn. Industry, 2 (1904), p. 399.
2. L. Kerker and R. Muller, “The Plasma Reforming Process from Chemische Werke Huels AG for the Production of Reduction Gases,” Stahl und Eisen (1984).
3. R.C. Eschenbach and R.J. Wickham, “Metal-Ceramic Ablative Coatings,” WADD TR61-100 (1961).
4. G.K. Baht, “Establishment of a Plasma Melting Manufacturing Process for Production of Nickel-base Alloys,” AFMLTR-75-80.
5. C. Asada and T. Adachi, “Plasma Induction Heating” (Paper presented at the Third International Symposium on Electroslag Melting Processes, Pittsburgh, PA, 1971).