1. Shadow optical methods of caustics;Kalthoff,1987
2. On the method of caustics: an exact analysis based on geometrical optics;Rosakis;J. Elasticity,1985
3. Publications of the Photomechanics Group of the National University of Athens;Theocaris,1971
4. The method of caustics;Rossmanith,1988
5. Some Basic Problems of the Mathematical Theory of Elasticity;Muskhelishvili,1953