Olivares, M., J. Lafarga, C. Galán, and P. Nadal. “Evaluation of Concrete Mechanical Strength through Porosity”. Materiales de Construcción 54, no. 273 (March 30, 2004): 21–34. Accessed February 7, 2023. https://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/220.