Morgan Maureen M., The Musical Setting of Psalm 134 – The Polyeleos

Morgan Maureen M., 

«The Musical Setting of Psalm 134 – The Polyeleos», Studies in Easter Chant, vol. 3, p. 112-123. 

London 1973

PDF 

Morgan Maureen M., The 'Three Teachers' and their Place in the History of Greek Church Music

Morgan Maureen M., 

«The 'Three Teachers' and their Place in the History of Greek Church Music», Studies in Eastern Chant 2, p. 86-99. 

London 1971

PDF