Arroyo, F., M. Alcalde, R. Villegas, and M. D. Robador. 2008. “Effect of the Diameter and Colour of Colorimeter Aperture Reducing Templates on Colour Coordinate Measurements”. Materiales De Construcción 58 (291):99-109. https://doi.org/10.3989/mc.2008.v58.i291.100.