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2. ‘You cannot just say: “I am singing the right note”’. Discussing intonation issues with Neue Vocalsolisten Stuttgart,;Havrøy;Music Pract,2013
3. Choir acoustics—an overview of scientific research published to date;Ternström;Int J Res Choral Sing,2003
4. Automatically extracting performance data from recordings of trained singers;Devaney;Psychomusicol Music Mind Brain,2011
5. Intonation drift in a capella soprano, alto, tenor, bass quartet singing with key modulation;Howard;J Voice,2007