1. F. B. Pickering, Micro Alloying 75,p. 9. Union Carbide Corp., New York, N.Y. 10017(1977).
2. D. E. Parsons, Division Report MRP/PMRL 77-4(R). PMRL, CANMET, Energy, Mines and Resources Canada, Ottawa (July 1977).
3. D. H. Stone and R. K. Steele, Rail steels-developments, processing and use, ASTM STP 644, p. 21 (1978).
4. R. Coladas et al. Metal Sci 509 (1977).
5. A. Rantanen and E. Rasanen, Vanadium in rail steels, Seminar Proc., p. 16. Vanitec, London (1979).