Every planar map is four colorable /

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Bibliographic Details
Main Authors:	Appel, Kenneth I., 1932-2013 (Author), Haken, Wolfgang (Author)
Format:	Electronic eBook
Language:	English
Published:	Providence, Rhode Island : American Mathematical Society, [1989]
Series:	Contemporary mathematics (American Mathematical Society) ; v. 98.
Subjects:	Four-color problem. Electronic books.
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