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2. P.J. Macken and A.A. Smith: CDA Publication No. 31, 1966, p. 27.
3. R. Thomson and J.O. Edwards: AFS Trans., 1978, 15B, pp. 395–400.
4. S. Sarkar and A.P. Bates: Br. Foundryman, 1967, vol. 60 (2), pp. 38–43.
5. R. Thomson: AFS Trans., 1968, vol. 76, pp. 189–99.