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"On the b-coloring of P4-tidy graphs" (2011) Velasquez, C.I.B.; Bonomo, F.; Koch, I. Discrete Applied Mathematics. 159(1):60-68
"The clique operator on circular-arc graphs" (2010) Lin, M.C.; Soulignac, F.J.; Szwarcfiter, J.L. Discrete Applied Mathematics. 158(12):1259-1267