Ore, Oystein, 1899-1968.

The four-color problem. [[Book] /] Oystein Ore. - New York : Academic Press, 1967. - xv, 259 p : illus ; 24 cm. - Pure and applied mathematics, a series of monographs and textbooks ; 27 .

Bibliography: p. 249-253.

All Ages.


Four-color problem.

513.83

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