1. ATIS-0100523.2011; 2011.
2. ASTM E1130-08. Standard test method for objective measurement of speech privacy in open plan spaces using articulation index; 2008.
3. ISO 3382-3. Acoustics – measurement of room acoustic parameters – Part 3: Open plan offices; 2012.
4. ANSI S3.5-1969. American national standard methods for the calculation of the articulation index; 1969.
5. IEC 60268-16 Ed. 4.0. Objective rating of speech intelligibility by speech transmission index; 2011.