1. C.F. Walton, Gray and Ductile Iron Castings Handbook, Iron Founders’ Society Inc., Cleveland, 1973, pp. 193–194.
2. R.A. Flinn, P.K. Trojan, Engineering Materials and their Application, Houghton Mifflin, Boston, MA, 1990, p. 440.
3. C.F. Walton, Iron Castings Handbook, Iron Castings Society Inc., Cleveland, 1981, p. 205.
4. R. Elliott, Cast Iron Technology, Butterworth, London, 1988, p. 7.
5. J.A. Jacobs, T.F. Kilduff, Engineering Materials Technology, Prentice-Hall, London, 1994, p. 229.