1. see for instance: G. Benz, G. Mutschler, G. Schneider: German patent no. DE 3413019, April 1984, or C. Reed, S. Rzad, J. Devins: US patent no. 4927704, May 1990.
2. Society of Vacuum Coaters, Proceedings 44th Annual Technical Conference, Philadelphia;Beckmann,2001
3. Handbook of Polymer Degradation;Picket,2000