1. W.E. Martin, Trans. Am. Foundrymen’s Soc, 50 (1942), pp. 766–784.
2. M.C. Mangalick, Light Metals, The Metallurgical Society of AIME, 2, (1974), pp. 613–634.
3. Private Communication, R. Johnson, GM Central Foundry, Bedford, October 1980.
4. R.E. Miller, L.C. Blayden and M.J. Bruno, Light Metals 1978, The Metallurgical Society of AIME, (197&), pp. 491–505.
5. CA. Licht, Light Metals 1977, The Metallurgical Society of AIME, (1977), pp. 279–290.