1. A. Kuske and G. Robertson, Photoelastic Stress Analysis (Wiley, New York 1974)
2. M. Born and E. Wolf, Principles of Optics, 6th ed. (Pergamon Press, Oxford 1980), 703.
3. J. C. Kemp, J. Opt. Soc. Am. 59, 950 (1969)
4. G.J. Felton, M.Eng. Thesis, Howard University, August 1986
5. K. Shibahara, S. Nishino, and H. Matsunami, Mat. Res. Soc. Symp. Proc. 97, 183 (1987)