[1] W R Rodriguez, O Saz, E Lleida, Analisis robusto de la voz infantil con aplicacion en terapia de voz, Arete 10, 70 (2010).

[2] T Cervera, J L Miralles, J Gonzalez-Alvarez, Acoustical analysis of Spanish vowels produced by laryngectomized subjects, J. Speech Lang. Hear Res. 44, 988 (2001).
http://dx.doi.org/10.1044/1092-4388(2001/077)

[3] J Munoz, E Mendoza, M D Fresneda, G Carballo, P Lopez, Acoustic and perceptual indicators of normal and pathological voice, Folia Phoniatr. Logop. 55, 102 (2003).
http://dx.doi.org/10.1159/000070092

[4] H K Vorperian, R D Kent, Vowel acoustic space development in children: A synthesis of acoustic and anatomic data, J. Speech Lang. Hear Res. 50, 1510 (2007).
http://dx.doi.org/10.1044/1092-4388(2007/104)

[5] S P Whiteside, Sex-specific fundamental and formant frequency patterns in a cross-sectional study, J. Acoust. Soc. Am. 110, 464 (2001).
http://dx.doi.org/10.1121/1.1379087

[6] P White, Formant frequency analysis of children's spoken and sung vowels using sweeping fundamental frequency production, J. Voice, 13, 570 (1999).
http://dx.doi.org/10.1016/S0892-1997(99)80011-3

[7] R O Coleman, Male and female voice quality and its relationship to vowel formant frequencies, J. Speech Lang. Hear Res. 14, 565 (1971).

[8] S Bennett, Vowel formant frequency characteristics of preadolescent males and females, J. Acoust. Soc. Am. 69 231 (1981).
http://dx.doi.org/10.1121/1.385343

[9] A R Bradlow A comparative acoustic study of English and Spanish vowels, J. Acoust. Soc. Am. 97, 1916 (1995).
http://dx.doi.org/10.1121/1.412064

[10] P Boersma, D Weenink, Praat: doing phonetics by computer [Computer program], Version 5.3.51, retrieved 2 June 2013 from http://www.praat.org/.

[11] J I Hualde, The sounds of Spanish, Cambridge University Press, Cambridge (2005).

[12] J C Casado Morente, J A Adrian Torres, M Conde Jimenez, D Piedrola Maroto, V Povedano Rodriguez, E Munoz Gomariz, E Cantillo Banos, A Jurado Ramos, Estudio objetivo de la voz en poblacion normal y en la disfonia por nodulos y polipos vocales, Acta Otorrinolaringol. Esp. 52, 476 (2001).
http://dx.doi.org/10.1016/S0001-6519(01)78239-8

[13] J Kreimana, B R Gerrattb, Perception of aperiodicity in pathological voice, J. Acoust. Soc. Am. 117, 2201 (2005).
http://dx.doi.org/10.1121/1.1858351

[14] H F Wertzner, S Schreiber, L Amaro, Analysis of fundamental frequency, jitter, shimmer and vocal intensity in children with phonological disorders, Rev. Bras. Otorrinolaringol. 71, 582 (2005).
http://dx.doi.org/10.1590/S0034-72992005000500007