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Every Planar Map is Four Colorable
About this Title
Kenneth Appel and Wolfgang Haken
Publication: Contemporary Mathematics
Publication Year:
1989; Volume 98
ISBNs: 978-0-8218-5103-6 (print); 978-0-8218-7686-2 (online)
DOI: https://doi.org/10.1090/conm/098
MathSciNet review: 1025335
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