1. U.S. patents 1,755,554, 1,755,555, 1,755,556, and 1,1755,557 (22 April 1930).
2. A.P. Gaghebin, The Fundamentals of Iron and Steel Castings (Toronto, Ont., Canada: The International Nickel Company, 1957).
3. L.B. Pfeil, N.B. Allen, and C.G. Conway, I.S.I. Special Report No. 43 (July 1952), pp. 37–45, unpublished report.
4. W. Betteridge and J. Heslop, The Nimonic Alloys, second edition, (Bristol, U.K.: Edward Arnold, 1974).
5. J.S. Benjamin, Met. Trans., 1 (1970), pp. 2943–2951.