H. G. Hillenbrand, A. Liessem, K. Biermann, C. J. Heck- mann and V. Schwinn, “Development of Grade X120 Pipe Material for High Pressure Gas Transportation Lines,” 4th International Conference on Pipeline Technology, Ostend, 9-12 May 2004, pp. 1-9.
 H. G. Hillenbrand, A. Liessem, K. Biermann, C. J. Heck- mann and V. Schwinn, “Development of High Strength Material and Pipe Production Technology for Grade X120 Linepipe,” International Pipeline Conference IPC Calgary, Alberta, 4-8 October 2004, pp. 1743-1749.
 H. G. Hillenbrand, A. Liessem, K. Biermann, C. J. Heck- mann and V. Schwinn, “Development and Production of Linepipe Steels in Grade X100 and X120,” Seminar of X120 Grade High Performance Pipe Steels, Technical Conference, Beijing, 28-29 July 2005, pp. 1-11.
 A. H, E. Tsuru, T. Hara, M. Sugiyana, Y. Terada, H. Shinada, S. Ohkita, H. Morimpto, N. Doi, M. Murata, H. Miyazaki, E. Yamashita, T. Yoshida, N. Ayukawa, H. Akasaki, M. L. Macia, C. W. Petersen, J. Y. Koo, N. V. Bangaru and M. J. Luton, “Pipe Production Technology and Properties of X-120 Linepipe,” Proceedings of the 13th International Offshore and Polar Engineering Conference Honolulu, Hawaii, 25-30 May 2003, pp. 43-49.
 H. Asahi, T. Hara, E. Tsuru, Y. Terada, M. Sugiyama, N. Maruyama, H. Morimoto, K. Shinada, K. Koyama, M. Murata, N. Doi, H. Miyazaki, T. Yoshida, N. Ayukawa and H. Akasaki, “The Metallurgical Design of High- Strength Steel and Development of X120 UOE Line Pipe,” Pipeline Technology Proceedings, Belgium, Vol. 1, 9-13 May 2004, pp. 851-871.
 H. Asahi, E. Tsuru, S. Ohkita, N. Maruyama, K. Koyama, H. Akasaki, M. Murata, H. Miyazaki, T. Hara, H. Morimoto, M. Sugiyama, K. Shi-nada, Y. Terada, N. Ayukawa, N. Doi and T. Yoshida, “Development of Ultra- High- Strength Linepipe, X120,” Nippon Steel Technical Report No. 90, July 2004, UDC 669.14.018.292-462.2:621. 643.23.
 H. G. Hillen-brand, C. Kalwa and A. Liessem, “Technological Solution for Ultra-High Strength Gas Pipeline,” 1st International Conference on Super-High Strength Steels, Rome, 2-4 November 2005, pp 1-12.
 M. D. Herynk, S. Kyriakides, A. Onoufriou and H. D. Yun, “Effects of the UOE/UOC Pipe Manufacturing Pro- cesses on Pipe Collapse Pressure,” International Journal of Mechanical Sciences, Vol. 49, No. 5, 2007, pp. 533- 553. doi:10.1016/j.ijmecsci.2006.10.001
 J. Raffo, R. G. Toscano, L. Mantovano and E. N. Dvorkin, “Numerical Model of UOE Steel Pipe: Forming Process and Structural Behavior,” In: S. A. Elaskar, E. A. Pilotta and G. A. Torres, Eds., Mecanica Computacional, Vol. 26, October 2007, pp. 317-333.