1. 2) AWS : AWS Specification-Underwater Welding, Apr. 1980
2. 3) R. P. LYNCH and F. J. PILIA : Welding.J., 48 (1969) 3, p. 183; B. C. GILMAN : OTC 1252, p. II-244 (1970)
3. 4) H. O. MOHR, M. KLUTTZ, and E. W. BILL : OTC 1782, p. I-515 (1973)
4. 5) E. A. SILVA and T. H. HAZLETT : Welding J., 50 (1971) 6, p. 406
5. 6) P. R. REDSHAW, A. W. STALKER, and K. ALLEN : OTC 3349, p. 2581 (1978); P. R. REDSHAW and A. W. STALKER : OTC 3523 (1979), p. 1431