Lazarov Stefan, A Medieval Slavonic Theoretical Treatise on Music

Lazarov Stefan, 

«A Medieval Slavonic Theoretical Treatise on Music», in: Conomos Dimitri (ed.), Studies in Eastern Chant V, p. 153-186. 

New York 1990

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Lazarov Stefan, A Few Pages from the History of Bulgarian Music

Lazarov Stefan, 

«A Few Pages from the History of Bulgarian Music», Studies in Easter Chant, vol. 3, p. 98-111. 

London 1973

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Lazarov Stefan, The Synodikon of Tsar Boril and the Problem of Byzantino-Bulgarian Musical Relations

Lazarov Stefan, 

«The Synodikon of Tsar Boril and the Problem of Byzantino-Bulgarian Musical Relations», Studies in Eastern Chant 2, p. 69-85. 

London 1971

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