Beaudou L, Hernández-Vélez C, Salazar G. Making a Graph Crossing-Critical by Multiplying its Edges. Electron. J. Combin. [Internet]. 2013Mar.24 [cited 2026May29];20(1):#P61. Available from: https://www.combinatorics.org/ojs/index.php/eljc/article/view/v20i1p61