MathSciNet bibliographic data

MR543795 (58 #27598d) 05C15 Appel, K.; Haken, W. Supplement to: ``Every planar map is four colorable. I. Discharging'' (Illinois J. Math. 21 (1977), no. 3, 429--490) by Appel and Haken; ``II. Reducibility'' (ibid. 21 (1977), no. 3, 491--567) by Appel, Haken and J. Koch. Illinois J. Math. 21 (1977), no. 3, 1--251. (microfiche supplement).

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