Bibliography
[Miller2008] Resonance in Singing. Voice Building through Acoustic Feedback. Inside View Press. 2008. ISBN 978-0-9755307-5-7.
[Saus2004] Oberton singen. Das Geheimnis einer magischen Stimmkunst. Traumzeit-Verlag. 2004. ISBN 3-933825-36-9.
[Herbst2010] Electroglottographic wavegrams: a technique for visualizing vocal fold dynamics noninvasively. Journal of the Acoustical Society of America. 128. 3070–3078. doi:10.1121/1.3493423.