共 10 条
[3]
HOPF H, 1941, COMMENT MATH HELV, V14, P257
[4]
Kurosh AG, 1955, THEORY GROUPS, VI
[5]
Magnus W., 1939, MONATSH MATH PHYS, V47, P307
[6]
NEUWIRTH L, 1959, THESIS PRINCETON
[8]
Seifert H., 1935, MATH ANN, V110, P571
[9]
Whitehead J., 1937, J LOND MATH SOC, V12, P63
[10]
[No title captured]