1. E.S. Folias International Journal of Fracture Mechanics, 1, 1, March 1965. pp. 20–46. See also ARL 64–23, Aerospace Research Laboratories, Office of Aerospace Research, U. S. Air Force, January 1964.
2. E.E. Sechler and “The Critical Crack Length in Pressurized, Monocoque Cylinders.” Final Report on M.L. Williams Contract NAw-6525, California Institute of Technology, September 1959. See also: M.L. Williams, Proceedings of the Crack Propagation Symposium, 1, College of Aeronautics, Cranfield (England), September 1961, pp. 130-165.
3. E.S. FoliasARL 64-174, Aerospace Research Laboratories, Office of Aerospace Research, U.S. Air Force, October 1964.
4. K.MarguerreProceedings of Fifth Congress of Applied Mechanics, 1938, pp.93–101.
5. J.K. Knowles and N.M. Wang Journal of Mathematics and Physics39, 1960, pp. 223–236.