. . "Packing chromatic number"@en . "Graph coloring"@en . "d8d93294496c1bf0752797da439a8d49" . "Valencia-Pabon" . "Chromatic strength"@en . "Mario Valencia-Pabon" . "Hypercube graphs"@en . "Upper bound"@en . . "Minimum sum coloring"@en . "Mario" . .