references

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Ashby & Jones (2006) //Engineering Materials 2// (3rd ed.) .Oxford: Butterworth-Heinemann

Askeland & Phule (2003) //The Science and Engineering of Materials// (4th ed.). California: Brooks/Cole

Gnehm OM-150 Universal Hardness Tester - Albert Gnehm machine tool manufacturers Horgon Switzerland

Macquarie Dictionary and Thesaurus.(2007) Sydney: Macquarie Dictionary Publishers

Schlenker (1981) //Introduction to Materials Science// Sydney: John Wiley and Sons

Sheedy P.A. (1994) //Materials their properties testing and selection// (3rd ed.). Forestville, NSW: Technical Secretarial Service