1. I.S. Raju and J.C. Newman, Jr., ?Improved Stress Intensity Factors for Semi-Elliptical Surface Cracks in Finite-Thickness Plates? NASA TM X-72825. Fourth International Conference on Structural Mechanics in Reactor Technology, San Francisco, Aug. 15?19, 1977.
2. Standard Test Method for Plane-Strain Fracture Toughness of Metallic Materials, ANSI/ASTM E 399-78.
3. Private Communication from J.G. Kaufman, Chairman of ASTM Committee E-24 on Fracture Testing, to W.F. Brown, Jr., NASA Lewis Research Center, Cleveland, Ohio.
4. Private Communication from W.F. Brown, Jr., to J.G. Kaufman.
5. J.P. Gyekenyesi and A. Mendelson,International Journal of Fracture 11 (1975) 409?429.