Julio Martínez Calzón, Manuel Juliá Vilardell, Álvaro Serrano Corral and Miguel Gómez Navarro. Structural Engineering International. 2008-11, n. 4 v. 18 [2015-01-20]. (原始内容存档于2013-12-28) (英语).请检查|date=中的日期值 (帮助)
Julio Martínez Calzón, Manuel Juliá Vilardell, Álvaro Serrano Corral and Miguel Gómez Navarro. Structural Engineering International. 2008-11, n. 4 v. 18 [2015-01-20]. (原始内容存档于2013-12-28) (英语).请检查|date=中的日期值 (帮助)