The European Coin Find Network (ECFN) ‒ https://fundmuenzen.org/
Nomisma project ‒ http://nomisma.org/
Sofia University “St. Kliment Ohridski” ‒ https://www.uni-sofia.bg/eng
The European Coin Find Network (ECFN) ‒ https://fundmuenzen.org/
Nomisma project ‒ http://nomisma.org/
Sofia University “St. Kliment Ohridski” ‒ https://www.uni-sofia.bg/eng