1. H. C. Chen, Structural Strength of Welding, 1st ed., p.200, Fu-Wen Book Company, Taiwan (1995).
2. H. S. Chou, Weld. Cutt. 2, 83 (1992).
3. Y. C. Lin, Mech. Techno. 48, 48 (1989).
4. E. Enke, Maschinenmarkt 48, 37 (1955).
5. A. G. Hebel, Jr., Metal Process. 128, 51 (1985).