1. Relation of rebetiko song with traditional song and Byzantine music. The history of rebetiko page (in Greek). Available at: http://www.rebetiko.gr/history.php. Accessed September 16, 2012.
2. Modern Greek music. Wikipedia page (in Greek). Available at: http://el.wikipedia.org/wiki/. Accessed November 20, 2012.
3. The Science of the Singing Voice;Sundberg,1987
4. Aerodynamic and acoustical measures of speech, operatic, and broadway vocal styles in a professional female singer;Stone;J Voice,2003
5. Comparisons of pharynx, source, formant, and pressure characteristics in operatic and musical theatre singing;Sundberg;J Voice,1993