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Cheng, Hock Tian; Mohammed, Bashar S.; Mustapha, Kamal Nasharuddin (3 March 2009). "Experimental and analytical analysis of pretensioned inverted T-beam with circular web openings". International Journal of Mechanics and Materials in Design. 5 (2): 203–215. doi:10.1007/s10999-009-9096-4. S2CID136040255.