共 12 条
[3]
Alexandroff P, 1943, T AM MATH SOC, V54, P286
[5]
Cech E., 1932, FUND MATH, V19, P149
[8]
EILENBERG S, UNPUB F ALGEBRAIC TO
[10]
LEFSCHETZ S, 1942, AM MATH SOC C SERIES, V27