1. J.M. Anderson(1972 ) Applied Dental Materials , 4th edn , p.84 . Blackwell Scientific Publications, Oxford.
2. P. BuNisset(1972 ) Contribution a I'utilisation des alliages nickel-chrome en prothese fixe coulee ,Doctoral thesis. University of Aix-Marseille, Marseille, France.
3. R.G. Craig, and F.A. Peyton(1975 ) Restorative Dental Materials , 5th edn , pp. 319 and319 . C.V. Mosby Co., St. Louis, U.S.A.
4. A.J. Fenner(1965 ) Mechanical Testing of Materials , p.25 . George Newnes Limited, London.
5. Improved Tensile Specimen for Dental Casting Gold Alloys