1. Private communication;Barber,1993
2. Private communication;Plint,1993
3. The Friction and Lubrication of Solids, Part II;Bowden,1964
4. The importance of electron transfer processes to the wear process;Goldblatt,1982
5. Tribo-electrification mechanism for self-mated metals in dry severe wear process, Part I Pure hard metals;Chiou;Wear,2003