1. C. V. Sundaram, P. Rodriguez, and S. L. Mannan:J. Inst. Engrs. (India), 1986, vol. 67, pp. 1–11.
2. F. C. Hull:Weld. J., 1967, vol. 46, pp. 399s-409s.
3. C. D. Lundin, W. T. DeLong, and D. F. Spond:Weld. J., 1975, vol. 54, pp. 241s-46s.
4. T. G. Gooch:The Welding Institute Research Bulletin, 1974, vol. 15, pp. 183–88.
5. P. E. Manning, D. J. Duquette and W. F. Savage:Weld. J., 1980, vol. 59, pp. 260s-62s.