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Every planar map is four colorable. Part II: Reducibility

, , and . Illinois J. Math., 21 (3): 491--567 (September 1977)

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Every planar map is four colorable. Part II: Reducibility, , and . Illinois J. Math., 21 (3): 491--567 (September 1977)Special announcement., and . Discret. Math., 16 (2): 179-180 (1976)Every planar map is four colorable. Part I: Discharging, and . Illinois J. Math., 21 (3): 429--490 (September 1977)Every Planar Map is Four-Colorable, and . Illinois Journal of Mathematics, (1977)