Bernardo, Luis F. A., and Sergio M. R. Lopes. “High-Strength Concrete Hollow Beams Strengthened With External Transversal Steel Reinforcement under Torsion”. Journal of Civil Engineering and Management 17, no. 3 (September 20, 2011): 330-339. Accessed March 28, 2024. https://journals.vilniustech.lt/index.php/JCEM/article/view/5230.