1. Thermal and chemico-thermal treatments of ferrous materials to reduce wear;Gregory;Tribology,1970
2. Granodine Phosphating Processes, Imperial Chemical Industries Ltd., London
3. Tomlinson A. Black Oxide Coatings, Product Finishing
4. A Guide to Hard Anodising, A corn Hardas Ltd, Boreham Wood, Herts, UK
5. Improve hardness, corrosion resistance, lubricity with a single synergistic coating,1972