C. Gustilo PhD, Reggie, et al. “Application of Inverted Cathode Transverse Magnetic Field in Vacuum Arc During Surface Treatments Reusable Metals”. International Journal of Engineering & Technology, vol. 7, no. 4.16, Nov. 2018, pp. 225-8, https://doi.org/10.14419/ijet.v7i4.16.27833.