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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: http://dx.doi.org/10.1090/conm/098
MathSciNet review: 1025335

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