Maybe start with this recent paper and look at the references they cite:

Article Evaluation of performance monitoring ERPs through difficulty...

Thank you Brittany for your suggestion. I looked up some of their references after mentioning Pc, more specifically Van der Borght et al., 2016, however this paper only explores Pc/Pe differences. So, Pc only figures as a contrast for Pe, like in the rest of the literature. What I would like to know about is a more specific evaluation of what processes contribute to Pc itself. I will have a closer look at other references and will keep you updated. Thanks again!