共 6 条
[1]
Danzer L., 1963, P S PURE MATH, V7, P101, DOI [10.1090/pspum/007, DOI 10.1090/PSPUM/007, 10.1090/pspum/007/0157289, DOI 10.1090/PSPUM/007/0157289]
[2]
DAY MM, 1947, T AM MATH SOC, V62, P315
[3]
Grunbaum B, 1964, ARCH MATH, V15, P76, DOI 10.1007/BF01589171
[4]
Hadwiger H., 1960, MONOGRAPHIES ENSEIGN, V2
[5]
Hadwiger H., 1964, COMBINATORIAL GEOMET
[6]
Ore O., 1967, 4 COLOR PROBLEM