The k-fold clique transversal problem is to locate a minimum set Omega of vertices of a graph such that every maximal clique has at least k elements of Omega. The maximum h-colourable subgraph problem is to find a maximum subgraph of a graph which is h-colourable. We show that the k-fold clique transversal problem and the maximum h-colourable subgraph problem are polynomially solvable on balanced graphs. We also provide a polynomial algorithm to recognize balanced graphs. (C) 1998 Elsevier Science B.V.
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Univ Paris Diderot, UFR Math, 5 Rue Thomas Mann, F-75205 Paris 13, FranceUniv Calif Berkeley, Dept Elect Engn & Comp Sci, 253 Cory Hall, Berkeley, CA 94720 USA
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Univ Nacl Gen Sarmiento, Inst Ciencias, Buenos Aires, DF, ArgentinaUniv Buenos Aires, FCEyN, Dept Comp, RA-1053 Buenos Aires, DF, Argentina
Marenco, Javier
Saban, Daniela
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Univ Buenos Aires, FCEyN, Dept Comp, RA-1053 Buenos Aires, DF, Argentina
Univ Nacl Gen Sarmiento, Inst Ciencias, Buenos Aires, DF, ArgentinaUniv Buenos Aires, FCEyN, Dept Comp, RA-1053 Buenos Aires, DF, Argentina
Saban, Daniela
Stier-Moses, Nicolas E.
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Columbia Univ, Grad Sch Business, New York, NY 10027 USAUniv Buenos Aires, FCEyN, Dept Comp, RA-1053 Buenos Aires, DF, Argentina