, Aparicio Bengoechea, A.C.; Ramos Schneid. “Test Program to Assess the Ultimate Behaviour of Externally Prestressed Concrete Beams”. Hormigón y Acero 45, no. 194 (January 10, 1994). Accessed May 19, 2024. http://www.hormigonyacero.com/index.php/ache/article/view/564.