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040   $aDip.to Matematica$beng
084   $aAMS 05C15
100 1 $aAppel, Kenneth I.$0222857
245 10$aEvery planar map is four colorable /$cKenneth Appel, Wolfgang Haken
260   $aProvidence, R. I. :$bAmerican Mathematical Society,$c1989
300   $axv, 741 p. ;$c25 cm
490 0 $aContemporary mathematics,$x0271-4132 ;$v98
650  0$aFour-color problem
700 1 $aHaken, Wolfgang$eauthor$4http://id.loc.gov/vocabulary/relators/aut$054072
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996   $aEvery planar map is four colorable$91455559
997   $aUNISALENTO
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