Try and find articles by Christof Boerhinger and
Christian Habicht.
Once you get into them you can find references in the bibliography.
How is your
French?
Francoise DeCallatay writes loads on coins. He is on academia and so is Andrew
Meadows, Catherine
Lorber in English.
Remember the later the reference the more controversial it is because they often update older but sacred texts.
See if you can access JSTOR-google it.
I believe that Schweizer Munzblatter a Swiss numismatic source is on-line somewhere.
Cic