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2. W. K. Wilson, Finite element methods for elastic bodies containing cracks. Mechanics of Fracture. Noordhoff I, Amsterdam.
3. On the finite element method in linear fracture mechanics;Chan;Engng Fracture mech.,1970
4. Use of finite element computer programs in fracture mechanics;Anderson;I. J. Fracture,1971
5. An elastic companion of two finite element maps for crack tip regions;Swedlow,1971