Vásquez L., José Mateo, and Bolivar Delgado-Gaete. “Extrinsic Factors Involved in the Pigmentation of Dental Composite Resins”. Revista Estomatológica Herediana, vol. 32, no. 3, Sept. 2022, pp. 263-71, doi:10.20453/reh.v32i3.4284.