Improving the Representation of Roles in Conceptual Modeling: Theory, Method, and EvidenceBera, P., Burton-Jones, A., & Wand, Y. (2018). Improving the representation of roles in conceptual modeling: Theory, method, and evidence. Requirements Engineering, 23(4), 465–491. https://doi.org/10.1007/s00766-017-0275-9
This journal article describes guidelines for representing roles in conceptual models and suggests rules for modeling roles with the widely used extended entity relationship.