1. Formant technique in a professional female singer;Sundberg;Acustica,1975
2. X-ray study of articulation and formant frequencies in two female singers;Johansson,1985
3. Acoustical consequences of lip, tongue, jaw, and larynx movement;Lindblom;J Acoust Soc Am,1971
4. Methodological studies of Movetrack-coil tilt and placement;Branderud,1994
5. Acoustic theory of speech production;Fant,1960