Approximation Results for the Minimum Graph Coloring Problem. - Marc Demange; Pascal Grisoni; Vangelis Th. Paschos (Inf. Process. Lett., 1994)

Differential Approximation Algorithms for Some Combinatorial Optimization Problems. - Marc Demange; Pascal Grisoni; Vangelis Th. Paschos (Theor. Comput. Sci., 1998)