The four-color problem
Ore, Oystein 1899-1968.
The four-color problem - New York : Academic Press, 1967 - xv, 259 p. : il. - Pure and applied mathematics. A series of monographs and textbooks , 27 .
p. 249-253
TEORIA DE GRAFOS
512.5 / O66f
The four-color problem - New York : Academic Press, 1967 - xv, 259 p. : il. - Pure and applied mathematics. A series of monographs and textbooks , 27 .
p. 249-253
TEORIA DE GRAFOS
512.5 / O66f