1. 1) Boron in Steel ed. by S. K. BANERJI and J. E. MORRAL (1979) [AIME]
2. 2) R. A. GRANGE and J. B. MITCHELL : Trans. ASM, 53 (1956), p. 157
3. 3) B. M. KAPADIA, R. M. BROWN and W. J. MURPHY : Trans. TMS AIME, 242 (1968), p. 1689
4. 4) M. UENO and T. INOUE : Trans. ISIJ, 13 (1973), p. 210
5. 5) G. F. MELLOY, P. R. SLIMON and P. P. PODGURSKY : Metall. Trans, 4 (1973), p. 2279