TY  - BOOK
AU  - Clifford,A.H.
AU  - Clifford,A.H.
AU  - Preston,G.B.
TI  - Algebraic theory of semigroups V 1
T2  - Mathematical surveys,
PY  - 1961///-
CY  - Rhode Island
PB  - American Mathematical Society
KW  - Algebra
ER  -