Methods of Perfect Coloring
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R. Pérez-Gómez, Ceferino Ruiz (2000)
Visual Mathematics
Fischer, Ilse (2001)
Séminaire Lotharingien de Combinatoire [electronic only]
Erickson, Alejandro, Ruskey, Frank, Woodcock, Jennifer, Schurch, Mark (2011)
The Electronic Journal of Combinatorics [electronic only]
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