Hell, Pavol Absolute planar retracts and the four colour conjecture. (English) Zbl 0267.05102 J. Comb. Theory, Ser. B 17, 5-10 (1974). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 15 Documents MSC: 05C10 Planar graphs; geometric and topological aspects of graph theory 57M15 Relations of low-dimensional topology with graph theory 55M15 Absolute neighborhood retracts PDFBibTeX XMLCite \textit{P. Hell}, J. Comb. Theory, Ser. B 17, 5--10 (1974; Zbl 0267.05102) Full Text: DOI References: [1] Harary, F.: Graph theory. (1969) · Zbl 0182.57702 [2] Hell, P.: Rétractions de graphes. Ph.d. thesis (1972) [3] Hell, P.: Retracts in graphs. The Proceedings of the capital conference on graph theory, combinatorics, and applications (June 1973) [4] P. Hell, Retractions of bipartite graphs, to be published. [5] Ore, O.: The four color problem. (1967) · Zbl 0149.21101 This reference list is based on information provided by the publisher or from digital mathematics libraries. Its items are heuristically matched to zbMATH identifiers and may contain data conversion errors. In some cases that data have been complemented/enhanced by data from zbMATH Open. This attempts to reflect the references listed in the original paper as accurately as possible without claiming completeness or a perfect matching.