Ivanov, I. (2025) “Τρισάγιον – in the Byzantineand Old Bulgarian Liturgical Practice. Characteristics, Features and Use in the Liturgical Tradition of the Church”, Forum Theologicum Sardicense, (1), pp. 7–60. Available at: https://periodicals.uni-sofia.bg/index.php/forum-theologicum-sardicense/article/view/408 (Accessed: 11 August 2025).