OSTAPCZUK, Jerzy. An Unknown Fragment of a Churchslavonic Tetragospel at Orthodox Seminary in Sofia. Slavistica Vilnensis, [S. l.], v. 55, n. 2, p. 134–139, 2010. Disponível em: https://www.zurnalai.vu.lt/slavistica-vilnensis/article/view/26919. Acesso em: 6 nov. 2025.