1. Ishikawa H, Nomura K, Mizuno Y, Michioka H, Fuwa Y, Yasuhara S. SAE Paper 960988.
2. Deposition and structural properties of two-component metal coatings for tribological applications
3. Huddlestone RH, Leonard SL. Plasma Diagnostic Techniques, New York: Academic Press, 1965. p. 204.
4. NIST Atomic Spectra Database, http://physics.nist.gov/PhysRefData/ASD1.