M. Arman, Z. Khalilak, M. Rajabi, E. Esnaashari, and K. Saati, “In Vitro Spectrophotometry of Tooth Discoloration Induced by Tooth-Colored Mineral Trioxide Aggregate and Calcium-Enriched Mixture Cement”, Iran Endod J, vol. 10, no. 4, pp. 226–230, Oct. 2015.