Looking for references regarding judicial dueling in late medieval Italy

May 2019
Massachusetts, USA

I have seen suggestion that judicial dueling (trial by combat as opposed to honor dueling, feats of arms, etc.) generally declined or disappeared in Italy (particularly in the communes of northern Italy) during the 14th century under the influence of Roman law and the church, while it continued to be practiced in other parts of Europe, particularly the German states and England much later. I have had little luck finding any good primary (or even secondary) sources covering this transition in Italy away from the practice. Any suggestions?

(Unfortunately I only read English so I can't do much with sources in Italian...)