1. L. P. Sablev, N. P. Atamansky, V. N. Gorbunov, J. J. Dolotov, V. N. Lutseenko, V. M. Lunev and V. V. Usov, US Patent 3, 793, 179, 1971.
2. Hard coatings by plasma-assisted PVD technologies: Industrial practice
3. Surface Technology;Mack,1990
4. Plasmabeschichtungsverfahren und Hartstoffschichten;Vetter,1992
5. German patent DE 41 25 365 C 1, 1992.