Kellner, H.J. "Keltische Münzen: Bemerkungen zur Situation der Forschung" in Passauer Jahrbuch 26 (1984).
Celtic Coins: Remarks on the state of research.
Also see:
Kellner Lower Bavarian
Kellner Nuremberg
Kellner Passau
Kellner von Manching
Celtic| and Tribal| Coins| for Sale| in the Forum| Ancient| Coins| Shop|.