Martín Patino, M. T., Madruga, F. and Saavedra, J. (1994) “Analysis of the size of sandstone particles from the Cathedrals of Salamanca. Independence between granulometry and deterioration”, Materiales de Construcción, 44(233), pp. 5–21. doi: 10.3989/mc.1994.v44.i233.593.