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A lemma to study the chromaticity of \(K_4\)-homeomorphs. (English) Zbl 1207.05047

Kamarul Haili, Hailiza (ed.) et al., Proceedings of the 5th Asian mathematical conference (AMC), June 22–26, 2009, Kuala Lumpur, Malaysia. Vol. I: Pure Mathematics. Penang: Universiti Sains Malaysia, School of Mathematical Sciences (ISBN 978-967-5417-53-5/CD-ROM). 22-28 (2009).
MSC:  05C15
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