1. Behaviour and reinforcement of concrete beams with large rectangular apertures;Prentzas,1968
2. Concrete beams with small openings under torsion;Mansur;Journal of the Structural Division, ASCE,1979
3. Circular openings in webs of continuous beams;Somes,1974
4. Behavior and design of prestressed concrete beams with large web openings;Barney;Prestressed Concrete Institute,1977
5. Collapse loads of reinforced concrete beams with large openings;Mansur;Journal of the Structural Division, ASCE,1984