1. Manogg, P., Anwendung der Schattenoptik zur Untersuchung des Zerreiss-vorganges von Platten. Dissertation, Freiburg, West Germany 1964.
2. Theocaris, P. S. and Gdoutos, E., An optical method for determining opening-mode and edge sliding-mode stress intensity factors. J. Appl. Mech. 39 (1972) 91–97.
3. Theocaris, P. S., The method of caustics applied to elasticity problems. In: Developments in stress analysis (G. Holister, ed.), 1979, pp. 27–63 (in print).
4. Beinert, J. and Kalthoff, J. F., Experimental determination of dynamic stress intensity factors by the method of shadow patterns. In Mechanics of fracture, Vol. VII (G. C. Sih, ed.), 1979 (in print).
5. Theocaris, P. S. and Ioakimidis, I. N., Technical note on the equations of caustics for crack and other plane elasticity problems. Engng. Fract. Mech. 12 (1979) 613–615.