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Raju, IS and Krishnamurty, AV and Rao, AK (1973) Sector elements for matrix displacement analysis. In: International Journal for Numerical Methods in Engineering, 6 (4). pp. 553-563.
Rao, AK and Raju, IS and Murty, Krishna AV (1971) A powerful hybrid method in finite element analysis. In: International Journal for Numerical Methods in Engineering, 3 (3). pp. 389-403.