Petrunov, Filip. “Торнезета от средновековния град Лютица: Tornesels from the Medieval Town of Lyutitsa”. Numismatics, Sigillography and Epigraphy | Нумизматика, сфрагистика и епиграфика 19 (December 20, 2023): 105–116. Accessed April 21, 2025. https://publications.naim.bg/index.php/NSE/article/view/391.