Ferreira, Nadia de Souza, et al. “Evaluation of Morphological and Chemical Alterations in Enamel, Dentin and Cementum After Internal Bleaching Technique Using Different Bleaching Agents”. Brazilian Dental Science, vol. 19, no. 4, Nov. 2016, pp. 56-62, doi:10.14295/bds.2016.v19i4.1286.