共 11 条
[2]
Clifford A. H., 1961, ALGEBRAIC THEORY SEM, VI
[4]
HARTWIG R, 1980, MATH JPN, V35, P1
[5]
HOWIE JM, 1966, J LONDON MATH SOC, V41, P707
[8]
HOWIE JM, 1973, J LOND MATH SOC, V7, P357
[9]
MITSCH H, 1973, J REINE ANGEW MATH, V264, P172