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Rao, Kanakapura S Subba and Singh, Shashikant (1987) Lower-bound collapse load Of square footing. In: Journal Of Structural Engineering-Asce, 113 (8). pp. 1875-1879.
Rao, Kanakapura S Subba and Ranganatham, Balagolam V (1977) Lower Bound Limit Analysis of Rectangular Slabs. In: Journal of the Structural Division ASCE, 103 (11). pp. 2193-2209.