TY  - GEN
AU  - Pollak, G
TI  - Algebraic theory semigroups
T2  - Colloquia Mathematica Societatis Janos Bolyai, 20
SN  - 0444852824
U1  - 512.22 
PY  - 1979///
CY  - Amsterdam
PB  - North-Holland
KW  - ALGEBRA
KW  - MATHEMATICS
KW  - SEMIGROUPS
ER  -