Villegas Sánchez, R., and J. F. Vale Parapar. 1993. “Evaluation of Water Repellent Treatments Applied to Stones Used in Andalusian Cathedrals. II. Salt Crystallization Test”. Materiales De Construcción 43 (230):5-13. https://doi.org/10.3989/mc.1993.v43.i230.679.