ALEXANDROV, O.; STANCHEV, S. LEAD COMMERCIAL SEALING FROM KOVACHEVSKO KALE. Numismatics, Sigillography and Epigraphy | Нумизматика, сфрагистика и епиграфика, [S. l.], v. 21, p. 243–250, 2025. DOI: 10.53250/nse21.243-250. Disponível em: https://publications.naim.bg/index.php/NSE/article/view/572. Acesso em: 14 jun. 2026.