1. N.D. Hung, Cours de Mécanique de la Rupture, LTAS—Mécanique de la Rupture des Solides, Université de Liège, Belgique.
2. Numerical Fracture Mechanics;Aliabadi,1991
3. S.N. Nasser (Ed.), On the monotony and the convergence of a special class of hybrid finite elements, The Metis elements. Variational Methods in the mechanics of solids, Proceedings of the IUTAM Symposium, Northwestern University, Evanston, IL, USA, Pergamon Press, Oxford, 1980, pp. 208–213.
4. E. Absi, R. Glowinski, On a special class of hybrid finite elements: the “metis”, Proceedings of the First International Congress of GAMNI, Dunod Technique, 1979, pp. 53–63 (in French).
5. The bending stress distribution at the base of a stationary crack;Williams;J. Appl. Mech.,1961