1. Y. B. Park, Ph.D. Thesis, p. 1, Seoul National University, Seoul (2004).
2. V. Shribman, Y. Livschitz, and O. Gafri, Advanced Transmission Design & Performance 21, 116 (2005).
3. H. Hokari, T. Sato, K. Kawauchi, and A. Muto, J. Japan Welding Society 15(4), 615 (1998)
4. C. Li, Z. Zhao, J. Li, Y. Wang, and Y. Yang, J. Mater. Process 123, 225 (2002).
5. P. Zhang, Ph.D. Thesis, p. 183, Ohio state university, Ohio state (2003).