共 7 条
[2]
Harary F, 1969, GRAPH THEORY, DOI DOI 10.21236/AD0705364
[3]
Howie J. M., 1976, INTRO SEMIGROUP THEO
[4]
KANUER U, 1989, ARCH MATH, V52, P607
[7]
Miller D.D., 1956, T AM MATH SOC, V82, P270