MathSciNet bibliographic data

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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