Brandes, Ulrik and Lerner, Jürgen. "Role-equivalent Actors in Networks." Paper presented at the meeting of the ICFCA 2007 Satellite Workshop on Social Network Analysis and Conceptual Structures: Exploring Opportunities, 2007.

Brandes, Ulrik and Lerner, Jürgen. "Structural Similarity in Graphs (A Relaxation Approach for Role Assignment).." Paper presented at the meeting of the ISAAC, 2004.