1. C. E., Inglis, Trans. Int. Naval Architects, 60 (1913)219.
2. A. A. Griffith, Reports and Memoranda, No. 1152 (M55), Aeronautical Research Committee (1928).
3. H., Neuber, Kerbspannungslehre, Springer-Verlag, Berlin (1937).
4. I. N. Sneddon and M. L. Lowengrub, Crack Problems in Classical Theory of Elasticity, John Wiley and Sons, Inc., New York.
5. N. I., Muskhelishvili, Some Basic Problems of The Mathematical Theory of Elasticity, Noordhoff International Publishing, Leyden (1974) 3rd English ed.