Reference: %22Overbeck,%20M.%20(2001).%20R%C3%B6mische%20Bleimarken%20im%20Civiche%20raccolte%20numismatiche%20zu%20Mailand%20=%20Tessere%20plumbee%20romane,%20Civiche%20raccolte%20numismatiche.%20Milan,%20Comune%20di%20Milano,%20Settore%20cultura,%20musei%20e%20mostre,%20Civiche%20raccolte%20numismatiche.%22