Sánchez, M. A., Molina, W. M., García, H. L. C., Guzmán, E. M. A., Acosta, A. A. T., Ortega, J. M. P. “Properties of Portland Cement Mortar with Substitutions of Natural and Expanded Perlite”, Periodica Polytechnica Civil Engineering, 62(2), pp. 508–516, 2018. https://doi.org/10.3311/PPci.11411