Souza, L. B. R. de, D. F. Monteiro, and T. R. de S. Araújo. “Acoustic Analysis of the Spoken Voice During the Pre and Post-Menstrual Periods: Comparative Study”. Journal of Medical and Biological Sciences, vol. 7, no. 2, Jan. 2008, pp. 115-22, doi:10.9771/cmbio.v7i2.4438.