1. T. Lyman, ?Metals Handbook? (The American Society for Metals, Ohio, 1948).
2. A. Pacz, USA Patent No. 1387900 (1920).
3. B. Chalmers, ?Progress in Materials Science?, Vol. 12 (Pergamon Press, Oxford, 1965).
4. Idem, ?Progress in Materials Science?, Vol. 15 (Pergamon Press, Oxford, 1970).
5. J. Charbonnier, J. Perrier andR. Portalier,AFS Int. Cast Metals J. 3 (1978) 17.