Bonnet Édouard, Feghali C, Nguyen T, Scott A, Seymour P, Thomassé S, Trotignon N. Graphs without a 3-Connected Subgraph are 4-Colourable. Electron. J. Combin. [Internet]. 2025Feb.28 [cited 2026May20];32(1):#P1.26. Available from: https://www.combinatorics.org/ojs/index.php/eljc/article/view/v32i1p26