Auger, David, Pierre Coucheney, and Kossi Roland Etse. “Linear Extensions of Rotor-Routing in Directed Graphs: Reachability Problems”. The Electronic Journal of Combinatorics 33, no. 2 (April 14, 2026): #P2.5. Accessed April 18, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v33i2p5.