KALBEKA, L. PRINCELY SEALS OF THE XIth – XIVth CENTURIES FROM THE TERRITORY OF POLOTSK (FROM THE FUNDS OF THE POLOTSK NATIONAL HISTORICAL AND CULTURAL MUSEUM-RESERVE). Vestnik of Polotsk State University. Part A. Humanities, [S. l.], n. 1, p. 81-85, 2021. Disponível em: https://journals.psu.by/humanities/article/view/1056. Acesso em: 8 nov. 2026.