1. S.A. Gedeon, C.D. Sorensen, and K.T. Ulrich:Weld. J., 1987, vol. 66, pp. 378s-85s.
2. D.W. Dickinson, J.E. Franklin, and A. Stanya:Weld. J., 1980, vol. 59, pp. 170s-76s.
3. W.F. Savage, E.F. Nippes, and F.A. Wassell:Weld. J., 1978, vol. 57, pp. 43s-50s.
4. T. Arai:Trans. Iron Steel Inst. Jpn., 1985, vol. 25, pp. 792–93.
5. N. Miura and T. Saito:Trans. Iron Steel Inst. Jpn., 1983, vol. 24, pp. 913–22.