Details findet man in Schäfer, T., May, P., and Koch, I. (2012). Computation and Visualization of Protein Topology Graphs Including Ligand Information. In German Conference on Bioinformatics 2012, volume 26 of OpenAccess Series in Informatics (OASIcs), pages 108–118, Dagstuhl, Germany. Leibniz-Zentrum für Informatik.