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Minimum sum coloring
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"Minimum sum set coloring of trees and line graphs of trees" (2011) Bonomo, F.; Durn, G.; Marenco, J.; Valencia-Pabon, M. Discrete Applied Mathematics. 159(5):288-294
"Minimum sum set coloring of trees and line graphs of trees" (2011) Bonomo, F.; Durn, G.; Marenco, J.; Valencia-Pabon, M. Discrete Applied Mathematics. 159(5):288-294