Diestel, Reinhard, and Julian Pott. “Orthogonality and Minimality in the Homology of Locally Finite Graphs”. The Electronic Journal of Combinatorics 21, no. 3 (September 11, 2014): P3.36. Accessed March 27, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v21i3p36.