IVANOV, Ivan. Τρισάγιον – in the Byzantineand Old Bulgarian Liturgical Practice. Characteristics, Features and Use in the Liturgical Tradition of the Church. Forum Theologicum Sardicense, [S. l.], n. 1, p. 7–60, 2025. Disponível em: https://periodicals.uni-sofia.bg/index.php/forum-theologicum-sardicense/article/view/408. Acesso em: 11 aug. 2025.