共 11 条
[2]
Chen JF, 1999, COMMUN ALGEBRA, V27, P4275
[4]
Howie J., 1976, An introduction to semigroup theory
[7]
Petrich M., 1999, CAN MATH SOC SER MON
[10]
WANG SF, 2005, J YUNNAN NATL U NATU, V14, P151