1. 1) M. G. FONTANA and D. STAEHLE: 7th World Petroleum Congress, Apr., (1967), Mexico City
2. 4) H. H. UHLIG: Corrosion and Corrosion Control, (1963), p.47, 120 [John wiley] New York
3. 5) E. E. DENHARD. Jr.: Corrosion, 16 (1960), p.359t
4. 6) S. BARNARTT: Corrosion, 18 (1962), p.322
5. 7) T. P. HOAR and J. G. HINES: J. Iron Steel Inst., 182 (1956), p.124