Keywords: Markström-Graph.svg Markström's 24-vertex cubic planar graph with no 4- or 8-cycles found in a computer search for counterexamples to the ErdÅ‘s “Gyárfás conjecture Own 2006-09-13 David Eppstein Files by User David Eppstein from en wikipedia undirected planar graphs Paul ErdÅ‘s 3-regular graphs Graphs with 24 vertices |