1. 1) C. P. LARRABEE and S. K. COBURN: First International Congress on Metallic Corrosion,(1962), p.276, [Butterworths]
2. 5) Metal Finishing, 65 (1967) 11, p.79.
3. Metal Finishing, 65 (1967) 12, p.79
4. 6) H. SCHWARZ: Werkstoffe Korrosion, 16 (1965), p.93, p.208
5. 7) J.E. HILLER: Werkstoffe Korrosion, 17 (1966), p.943