Pimentel, Joao Vitor, et al. “Self-Lubricating W-S-C-Cr Tribological Coatings Deposited by r.f. Magnetron Sputtering”.
International Conference on Plasma Surface Engineering
, vol. 2, no. 13, Mar. 2013, pp. 283-6, doi:10.3384/wcc2.283-286.