TY  - BOOK
AU  - Clifford,A.H.
AU  - Preston,G.B.
TI  - The algebraic theory of semegroups / 
U1  - 510 CLI P.2 
PY  - 1967///
CY  - Rhode Island : 
PB  - American Mathematical Society, 
KW  - Mathematics
KW  - Algebra
ER  -