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WikiPedia: Đồ_thị_Petersen http://mathworld.wolfram.com/PetersenGraph.html http://www.win.tue.nl/~aeb/drg/graphs/Petersen.htm... http://arxiv.org/abs/math.CO/9907050 http://www.cambridge.org/uk/catalogue/catalogue.as... //dx.doi.org/10.1016%2FS0021-9800(69)80116-X //dx.doi.org/10.1090%2FS0002-9904-1950-09407-5 //dx.doi.org/10.2277%2F0521435943 http://planetmath.org/?op=getobj&from=objects&id=5... https://commons.wikimedia.org/wiki/Category:Peters...