1. M. A. Arkoosh and N. F. Fiore Metall. Trans. 3, 2235 (1972).
2. W. Yeniscavich Weld. J. 45, 344s (1966).
3. B. Hemsworth, T. Boniszewski, and N. F. Eaton Met. Constr. Br. Weld. J. 1, 5 (1969).
4. F. N. Rhines and P. J. Wray Trans. ASM. 54, 117 (1961).
5. M. A. Abralov, and R. U. Abdurakhmanov Automation Welding 27, 7 (1974).