Bernardo, Luis, Jorge Andrade, and Luiz Pereira-De-Oliveira. “Reinforced and Prestressed Concrete Hollow Beams under Torsion”. Journal of Civil Engineering and Management 19, no. 1 (January 9, 2014): S141-S152. Accessed June 24, 2019. https://journals.vgtu.lt/index.php/JCEM/article/view/3967.