Yash Dafe, Dr. Rajeev Kumar. “A Comparatıve Study of Pre-Stressed Rectangular and Trapezoıdal Two and Three Cell Box Gırders usıng Sap2000 Software”. International Journal of Advanced Science and Technology, Vol. 29, no. 8s, June 2020, pp. 4333-48, http://sersc.org/journals/index.php/IJAST/article/view/25465.