1. Y. Toji, K. Hasegawa, H. Shigemoto, H. Kawabe, T. Fujita, Y.Tanaka, H. Nakamura, H. Ishida and H. Sakamoto: Development of Cold-stamped Door Impact Beams Made of 1180MPa Grade High Strength Steel Sheet: Review of Automotive Engineering, 30(2009),pp. 159-165.
2. S. Matsuyama: Delayed Fracture (The Nikkan Kogyo Shimbun,Ltd.,Tokyo), (1989), pp. 25-66 (in Japanese).
3. Y. Hosoya, S. Tsuyama, Y. Nagataki, S. Kanetoh, T. Izuishi and Y. Takada: Microstructure Control of Ultra-High Strength Steel Sheets: NKK Tech. Rep., 145(1994), pp. 33-39(in Japanese).
4. J. Iwaya, Y. Okano, H. Shirasawa and S. Sawaki: Ultra-High Strength Cold-rolled Steel Sheets for Automobile Door Beams: Kobe Steel Eng. Rep., 47-2(1997), pp. 42-45 (in Japanese).
5. Y. Toji, S. Takagi, M. Yoshino, K. Hasegawa and Y. Tanaka: Evaluation of hydrogen embrittlement for high strength steel sheets:Tetsu-to-Hagane, 95(2009), pp. 887-894 (in Japanese).