1. Muskhelishvili, N. I.: Some basic problems of the mathematical theory of elasticity. Leyden: Noordhoff 1975
2. Green, A. E.; Zerna, W.: Theoretical elasticity (2nd ed.). Oxford: Clarendon Press 1968
3. Lekhnitskii, S. G.: Theory of elasticity of an anisotropic elastic body. San Francisco: Holden-Day 1963
4. Sih, G. C.; Paris, P. C.; Irwin, G. R.: On cracks in rectilinearly anisotropic bodies. Int. J. Fracture Mech. 1 (1965) 189?203
5. Tada, H.; Paris, P. C.; Irwin, G. R.: The stress analysis of cracks handbook (2nd ed.). St. Louis: Paris Productions Inc. 1985