Hell, Pavol; Pan, Zhishi; Wong, Tsai-Lien; Zhu, Xuding Adaptable chromatic number of graph products. (English) Zbl 1179.05045 Discrete Math. 309, No. 21, 6153-6159 (2009). MSC: 05C15 05C76 PDFBibTeX XMLCite \textit{P. Hell} et al., Discrete Math. 309, No. 21, 6153--6159 (2009; Zbl 1179.05045) Full Text: DOI
Hell, Pavol; Zhu, Xuding On the adaptable chromatic number of graphs. (English) Zbl 1147.05031 Eur. J. Comb. 29, No. 4, 912-921 (2008). MSC: 05C15 PDFBibTeX XMLCite \textit{P. Hell} and \textit{X. Zhu}, Eur. J. Comb. 29, No. 4, 912--921 (2008; Zbl 1147.05031) Full Text: DOI
Hell, Pavol; Zhu, Xuding The circular chromatic number of series-parallel graphs. (English) Zbl 0944.05037 J. Graph Theory 33, No. 1, 14-24 (2000). Reviewer: C.-Q.Zhang (Morgantown) MSC: 05C15 05C35 PDFBibTeX XMLCite \textit{P. Hell} and \textit{X. Zhu}, J. Graph Theory 33, No. 1, 14--24 (2000; Zbl 0944.05037)
Hell, Pavol; Nešetřil, Jaroslav; Zhu, Xuding Complexity of tree homomorphisms. (English) Zbl 0868.05018 Discrete Appl. Math. 70, No. 1, 23-36 (1996). Reviewer: P.Kirschenhofer (Leoben) MSC: 05C05 68R10 05C15 05C38 PDFBibTeX XMLCite \textit{P. Hell} et al., Discrete Appl. Math. 70, No. 1, 23--36 (1996; Zbl 0868.05018) Full Text: DOI Link
Hell, Pavol; Nešetřil, Jaroslav; Zhu, Xuding Duality and polynomial testing of tree homomorphisms. (English) Zbl 0877.05055 Trans. Am. Math. Soc. 348, No. 4, 1281-1297 (1996). MSC: 05C85 68Q25 05C15 05C20 PDFBibTeX XMLCite \textit{P. Hell} et al., Trans. Am. Math. Soc. 348, No. 4, 1281--1297 (1996; Zbl 0877.05055) Full Text: DOI
Hell, Pavol; Nešetřil, J.; Zhu, Xuding Duality of graph homomorphisms. (English) Zbl 0846.05093 Miklós, D. (ed.) et al., Combinatorics, Paul Erdős is eighty. Vol. 2. Budapest: János Bolyai Mathematical Society. Bolyai Soc. Math. Stud. 2, 271-282 (1996). Reviewer: R.Bodendiek (Kiel) MSC: 05C99 05C05 05C38 05C20 PDFBibTeX XMLCite \textit{P. Hell} et al., Bolyai Soc. Math. Stud. 2, 271--282 (1996; Zbl 0846.05093)
Hell, Pavol; Zhou, Huishan; Zhu, Xuding On homomorphisms to acyclic local tournaments. (English) Zbl 0837.05066 J. Graph Theory 20, No. 4, 467-471 (1995). Reviewer: D.P.Brown (Carbondale) MSC: 05C20 PDFBibTeX XMLCite \textit{P. Hell} et al., J. Graph Theory 20, No. 4, 467--471 (1995; Zbl 0837.05066) Full Text: DOI
Hell, Pavol; Zhu, Xuding The existence of homomorphisms to oriented cycles. (English) Zbl 0831.05059 SIAM J. Discrete Math. 8, No. 2, 208-222 (1995). Reviewer: R.Scapellato (Milano) MSC: 05C99 05C20 05C38 PDFBibTeX XMLCite \textit{P. Hell} and \textit{X. Zhu}, SIAM J. Discrete Math. 8, No. 2, 208--222 (1995; Zbl 0831.05059) Full Text: DOI
Hell, Pavol; Zhu, Xuding Homomorphisms to oriented paths. (English) Zbl 0819.05030 Discrete Math. 132, No. 1-3, 107-114 (1994). Reviewer: J.Bang-Jensen (Odense) MSC: 05C20 05C38 05C75 05C15 PDFBibTeX XMLCite \textit{P. Hell} and \textit{X. Zhu}, Discrete Math. 132, No. 1--3, 107--114 (1994; Zbl 0819.05030) Full Text: DOI
Hell, Pavol; Zhou, Huishan; Zhu, Xuding Mutiplicativity of oriented cycles. (English) Zbl 0803.05029 J. Comb. Theory, Ser. B 60, No. 2, 239-253 (1994). Reviewer: W.G.Brown (Montreal) MSC: 05C38 05C15 05C20 PDFBibTeX XMLCite \textit{P. Hell} et al., J. Comb. Theory, Ser. B 60, No. 2, 239--253 (1994; Zbl 0803.05029) Full Text: DOI
Hell, Pavol; Zhou, Huishan; Zhu, Xuding Homomorphisms to oriented cycles. (English) Zbl 0794.05037 Combinatorica 13, No. 4, 421-433 (1993). Reviewer: P.Horák (Bratislava) MSC: 05C20 05C99 05C38 PDFBibTeX XMLCite \textit{P. Hell} et al., Combinatorica 13, No. 4, 421--433 (1993; Zbl 0794.05037) Full Text: DOI