Nega, F. ., and E. . Gebreyouhannes. “CHART DEVELOPMENT FOR THE ESTIMATION OF DEFLECTION IN PRE-STRESSED RAILWAY GIRDER”. Zede Journal of Ethiopian Engineers and Architects, vol. 34, Feb. 2023, pp. 10-19, http://ejol.aau.edu.et/index.php/ZEDE/article/view/6498.