Byzantine philosopky and old bulgarian writers from the last quarter of the 9th century by the end of the 12th century

Yordanova, G. (2023). Byzantine philosopky and old bulgarian writers from the last quarter of the 9th century by the end of the 12th century. (Character and interaction). Юбилеен сборник, посветен на 60-годишнината на доктор Данаил Димитров Петров. Шумен: Унив. изд. Епископ Константин Преславски, p. 152-161.