Petrakiev, Iliyan. “Статистически и хронологически анализ на монетите от средновековната крепост „Ряховец“: Statistical and Chronological Analysis of the Coins from Ryahovets Medieval Fortress”. Numismatics, Sigillography and Epigraphy | Нумизматика, сфрагистика и епиграфика 14 (December 28, 2018): 151–170. Accessed October 12, 2026. https://publications.naim.bg/index.php/NSE/article/view/122.