Shota
Παλαιό Μέλος
S. Frøyshov. The Early Development of the Eight Mode Liturgical System in Jerusalem // St. Vladimir's Theological Quarterly. New York, 2007. Vol. 51. P. 139–178.
http://www.mzh.mrezha.ru/lib/froyshov/fhv2007a.pdf
http://www.mzh.mrezha.ru/lib/froyshov/fhv2007a.pdf