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Showing items 1-9 of 9  (1 Page(s) Totally)
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Institution Date Title Author
國立中山大學 2000 Circular chromatic number of series-parallel graphs P. Hell ; X. Zhu
國立中山大學 1996 Duality of graph homomorphisms P. Hell;X. Zhu
國立中山大學 1996 Duality and polynomial testing of tree homomorphisms P. Hell;X. Zhu
國立中山大學 1996 Complexity of tree homomorphisms P. Hell;X. Zhu
國立中山大學 1995 The existence of homomorphisms to oriented cycles P. Hell ; X. Zhu
國立中山大學 1995 A note on homomorphisms to acyclic local tournaments P. Hell; H. Zhou; X. Zhu
國立中山大學 1994 Multiplicative oriented cycles P. Hell;H. Zhou;X. Zhu
國立中山大學 1994 Homomorphisms to oriented paths P. Hell; X. Zhu
國立中山大學 1993 Homomorphisms to oriented cycles P. Hell; H. Zhou; X. Zhu

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