Sondermann, Sebastian. Neue Aurei, Quinare und Abschläge der gallischen Kaiser von Postumus bis Tetricus. (Bonn, 2010).
There are 40 new obverse dies, 34 new reverse dies, and 66 new
die-combinations listed. This book is intended to be used in combination
with B. Schulte, Die Goldprägung der gallischen Kaiser von Tetricus, to
have access to the complete material and the die study. 145 new Specimens are listed in the catalog section (one coin per page), which were not listed by Schulte.