1. Charles F. Walton, in: Iron Casting Handbook, Iron Castings Society Inc., New York, 1981, p. 57.
2. Standard Specification for Gray Iron Castings, ASTM A48–94a, 1994, pp. 16–20.
3. Standard Terminology Relating to Iron Castings, ASTM A644–92, 1992, pp. 341–342.
4. Charles F. Walton, in: Gray and Ductile Iron Castings Handbook, The Gray and Ductile Iron Founders Society Inc., Cleveland, 1971, p. 247.
5. Charles F. Walton, in: Gray and Ductile Iron Castings Handbook, The Gray and Ductile Iron Founders Society Inc., Cleveland, 1971, p. 256.