Bernardi, Olivier. “Tutte Polynomial, Subgraphs, Orientations and Sandpile Model: New Connections via Embeddings”. The Electronic Journal of Combinatorics 15, no. 1 (August 25, 2008): R109. Accessed March 29, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v15i1r109.