Liu, Jianbing, Miaomiao Han, and Hong-Jian Lai. “Weighted Modulo Orientations of Graphs and Signed Graphs”. The Electronic Journal of Combinatorics 29, no. 4 (December 16, 2022): P4.47. Accessed March 27, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v29i4p47.