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2. A fracture mechanics approach to failure analyses of concrete materials, diss. University of Lund. Division of Building Materials;Modéer;Rep. TVBM-1001,1979
3. Fracture mechanics and damage mechanics, a combined approach;Janson;J. de Mecanique Appliquée,1977
4. Dugdale crack in a material with continuous damage formation;Jansson;Engng Fracture Mech.,1977
5. Blunt crack band propagation in finite element analysis;Bazant,1979