1. C. F. Tiffany and J. N. Masters, applied Fracture Mechanics, Fracture Toughness and Its Application, ASTM Special Technical Publication No. 381 (1965) 249?278.
2. A. E. Green and I. N. Sneddon, The Distribution of Stress in the Neighborhood of a Flat Elliptical Crack in an Elastic Solid, Proceedings of the Cambridge Philosophical Society, 46 (1950) 159?163.
3. G. R. Irwin, Crack Extension Force for a Part-Through Crack in a Plate, Journal of Applied Mechanics, 29, Trans. ASME, 84 (1962) 651?654.
4. C. F. Tiffany, P. M. Lorenz, and L. R. Hall, Investigation of Plane Strain Flaw Growth in Thick-Walled Tanks, NASA CR-54837 (February 1966).
5. L. R. Hall, Plane Strain Cyclic Flaw Growth in 2014-T62 Aluminum and 6A1-4V(ELI) Titanium, NASA CR-72396 (November 1968)