1. 1) M. A. Streicher: Corrosion, 14 (1958), 59t.
2. 2) L. G. Maclaughlin: Mater. prot., 2 (1963), 52.
3. 3) A. Gallegaro: Metallurgia ital, 55 (1963), 482.
4. 4) C. M. Louchs, E. B. Morns and E. A. Pirsh: Paper presented at the Ann. Congr. ASME, Paper No. A (1958), 282.
5. 5) H. O. Teeple: Corrosion, 8 (1952), 114.