Blanco-Varela, M. T., Martínez-Ramírez, S., Gener, M. and Vázquez, T. (2005) “Modifications induced by adding natural zeolitic pozzolans to cement paste”, Materiales de Construcción, 55(280), pp. 27–42. doi: 10.3989/mc.2005.v55.i280.204.