Otsmaa, Vello, and Tiit Pedak. “Practical Method of Flexural Strength Calculation of Reinforced and Prestressed Concrete Members”. Technological and Economic Development of Economy 13, no. 4 (December 31, 2007): 314-322. Accessed November 24, 2024. https://jcem.vgtu.lt/index.php/TEDE/article/view/7750.