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4. 4) Mojtahedi, S. and Gamble, W. L.: Ultimate Steel Stresses in Unbonded Prestressed Concrete, Journal of the Structural Division, ASCE, pp. 1159-1165, July 1978.
5. 5) Tam, A. and Pannell, F. N.: Ultimate Moment of Resistance of Unbonded Partially Prestressed Reinforced Concrete Beams, Magazine of Concrete Research (Wexham Springs), Vol. 28, No. 97, pp. 203-208, Dec. 1976.