Buzzi, S. “Prehomogeneization Influence on the Proportioning Control of Raws in Cement by Means of RFA (X Ray Fluorescence Analysis) and Digital Computation”. Materiales De Construcción, vol. 19, no. 134, June 1969, pp. 99-114, doi:10.3989/mc.1969.v19.i134.1594.