1.
Ivanov I. Τρισάγιον – in the Byzantineand Old Bulgarian Liturgical Practice. Characteristics, Features and Use in the Liturgical Tradition of the Church. FThS [Internet]. 2025 May 22 [cited 2025 Aug. 11];(1):7-60. Available from: https://periodicals.uni-sofia.bg/index.php/forum-theologicum-sardicense/article/view/408