Leber, I., and F. A. Blakey. “Some Effects of Carbon Dioxide on Mortars and Concrete”. Materiales de Construcción 7, no. 079 (February 28, 1957): 39–40. Accessed April 29, 2024. https://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/2151.