共 14 条
[1]
BROWDER W, 1962, P AARHUS S
[5]
HIRSCH MW, TO APPEAR
[7]
Milnor J. W., 1964, TOPOLOGY S1, V3, P53
[8]
Rothenberg M, 1965, TOPOLOGY, V3, P357
[10]
WALL CTC, 1966, AMER J MATH, V86, P20