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The four-color problem : assaults and conquest / Thomas L. Saaty and Paul C. Kainen.- New York : McGraw Hill, c1977.- IX, 217 p. ; 24 cm.
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The four-color problem : assaults and conquest / Thomas L. Saaty and Paul C. Kainen.- New York : McGraw Hill, c1977.- IX, 217 p. ; 24 cm.