Castañeda, Ángel Emilio, William Cobelo, Yoermes González, and José Álvarez. 2011. “A Look at Half a Century of Shells Foundations, Methods of Calculation and Associate Research in Cuba”. Revista Ingeniería De Construcción 26 (3):245-68. https://ojs.uc.cl/index.php/ric/article/view/17973.