Remove extra citations
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2 changed files with 3 additions and 7 deletions
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@ -546,4 +546,4 @@ it is difficult to find out if the nodes
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in a graph can be colored using $k$ colors
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so that no adjacent nodes have the same color.
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Even when $k=3$, no efficient algorithm is known
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but the problem is NP-hard \cite{gar79}.
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but the problem is NP-hard.
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