1. A. Liessem and M. Erdelen-Peppler: Proceedings of 5th Int. Pipeline Conf., Calgary, Canada, 2004, pp. 1871–78.
2. X. Zhang, and H. Gao: Trans. Jpn. Weld. Res. Inst., 2012, vol. 2011, pp. 101-04.
3. F. Minami, Y. Nakano, S. Suzuki, T. Shiwawu, Y. Moriya, Y. Hagiwara, and M. Toyoda: Weld. Int., 1995, vol. 9, pp. 546-53.
4. V. Gliha, T. Vuherer, B. Ule, and J. Vojvodic-Tuma: Sci. Technol. Weld. Join., 2004, vol. 9, pp. 399-406.
5. N. Ishikawa, T. Shinmiya, S. Igi, and J. Kondo: Proceedings of 6th Int. Pipeline Conf., Calgary, Canada, 2006, pp. 223–30.