Leydold, Josef, and Peter F. Stadler. “Minimal Cycle Bases of Outerplanar Graphs”. The Electronic Journal of Combinatorics 5, no. 1 (February 27, 1998): R16. Accessed March 27, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v5i1r16.