1. Selection of materials for lubricated journal bearings;De Gee;Wear,1976
2. Tufftride manuals and information, Degussa, West Germany
3. Tufftride - a new development reduces treatment costs and process toxicity;Astley;Heat Treatment of Metals,1975
4. Fundamental investigation on sulphurising and tufftride process;Oda;Mitsubishi Tech. Bulletin,1967
5. Resistance to wear and galling improved by tufftriding;Wheaton;Machine tool blue book,1968