Ding C. The Rotor-Routing Torsor and the Bernardi Torsor Disagree for Every Non-Planar Ribbon Graph. Electron. J. Combin. [Internet]. 2021Oct.8 [cited 2026Mar.27];28(4):P4.1. Available from: https://www.combinatorics.org/ojs/index.php/eljc/article/view/v28i4p1