1. P. Tong, T.H.H. Pian, and S.J. Lasry, International Journal for Numerical Methods in Engineering 7 (1973) 297?308.
2. P. Tong, International Journal for Numerical Methods in Engineering II (1977) 377?382.
3. S.G. Lekhnitskii, Theory of Elasticity of an Anisotropic Elastic Body, translated by P. Fern, Holden-Day Inc., San Francisco, CA (1963).
4. G.S. Sih, P.C. Paris and G.R. Irwin, International Journal of Fracture Mechanics 1 (1965) 189?203.
5. K.R. Gandhi, ?Analysis of an Inclined Crack Centrally Placed in an Orthotropic Rectangular Plate?, AMMRC TR 71?31 Army Material and Mechanics Research Center, Watertown, MA (1971) 1?19.