Salcedo, Dinora, et al. “Relationship Between the Percentages of Permeable Porosity and Specific Porosity Obtained by Different Methodologies in Concrete Samples”. Gaceta Técnica, vol. 7, no. 1, Dec. 2008, pp. 24-32, https://mail.revistas.uclave.org/index.php/gt/article/view/241.