1. Amilon K, Van de Weijer J, Schötz S (2007) The impact of visual and auditory cues in age estimation. In: Müller C (ed) Speaker classification II. Lectures notes in artificial intelligence. Springer, Berlin, pp 10–21. doi: 10.1007/978-3-540-74122-0_2
2. Anastasi JS, Rhodes MG (2006) Evidence for an own-age bias in face recognition. N Am J Psychol 8:237–252
3. Belin P, Bestelmeyer PEG, Latinus M, Watson R (2011) Understanding voice perception. Br J Psychol 102:711–725
4. Boersma P, Weenink D (2005) Praat: doing phonetics by computer (Version 5.2.18) [Computer program]. http://www.praat.org
5. Braun A (1996) Age estimation by different listener groups. Forensic Linguist 3:65–73