Gutowski, Grzegorz. “Every Plane Graph Is Facially-Non-Repetitively $C$-Choosable”. The Electronic Journal of Combinatorics 25, no. 1 (March 29, 2018): #P1.74. Accessed April 30, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v25i1p74.