共 5 条
[1]
Babai L, 1977, J GRAPH THEOR, V1, P125
[2]
GRIMMETT GR, 1976, Q J MATH OXFORD, V29, P141
[3]
MILNOR J, 1968, J DIFFER GEOM, V2, P1
[4]
Sabidussi G., 1960, MATH Z, V72, P446, DOI 10.1007/BF01162967
[5]
WOLF JA, 1969, J DIFFERENTIAL GEOME, V2, P421