S. Al-Nu’man, B. ., & A. Hasan Al-Yasseri, G. . (2006). Time-Dependent Deflection of Prestressed Concrete Members of any Concrete Compressive Strength. Journal of Engineering and Sustainable Development, 10(2), 1-18. https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/1800