1.
Jiang Y, Zhu X. $4$-Colouring of Generalized Signed Planar Graphs. Electron. J. Combin. [Internet]. 2020Aug.21 [cited 2026May13];27(3):#P3.31. Available from: https://www.combinatorics.org/ojs/index.php/eljc/article/view/v27i3p31