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MR543794 (58 #27598c) 05C15
Appel, K.; Haken, W. The class check lists corresponding to the supplement: "Every planar map is four colorable. I. Discharging'' (Illinois J. Math. 21 (1977), no. 3, 429–490). Illinois J. Math. 21 (1977), no. 3, C1-C210. (microfiche supplement).
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