Félix, M. C. C., R. P. C. de Araújo, M. T. B. Araújo, and M. J. P. Lima. “The Enamel Protection by Fluoride Ion in Mouthrinses: Study in Vitro”. Journal of Medical and Biological Sciences, vol. 3, no. 2, July 2004, pp. 201-17, doi:10.9771/cmbio.v3i2.4426.