, Marí Bernat, A.R. “Finite Elements Application to the Non Linear Analysis of Three-Dimensional Portal Frames in Prestressed and Reinforced Concrete.”. Hormigón y Acero 36, no. 156 (January 5, 1985). Accessed May 18, 2024. http://hormigonyacero.com/index.php/ache/article/view/990.