1. Architectural Acoustics. Blending Sound Sources, Sound Fields, and Listeners – Ando Y. (1998) Springer p. 193.
2. Architectural Acoustics – Long M. (2014) 2nd Ed. Academic Press p. 697.
3. Sven Kissner “a possible acoustic approach for multi-purpose auditoria suitable for both speech and music”;Barron;Appl Acoust,2017
4. Maria Cairoli, Daniele Stefanoni, Lo spazio del suono – Moretti e Vitali (2017) section II.
5. Ergan M.D.J – Architectural Acoustics (2007) Ross Publishing p. 135.