de Luxán, M. Pilar, and Tomás Vázquez. “Silicon Gel As Puzzolane Standard: Its Energetic Activity and Limitations”. Materiales de Construcción 25, no. 160 (December 30, 1975): 79–95. Accessed July 27, 2024. https://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/1256.