In-office dental bleaching efficacy assessment in function of the light exposure regime by digital colorimetric reflectance spectroscopy - Florez, F. L. E.; Andrade, M. F.; Campos, E. A.; Oliveira Júnior, O. B.; Bagnato, Vanderlei Salvador; Panhoca, V. H. (Journal of Dentistry and Oral Hygiene, 2011)