TY  - BOOK
AU  - Petrich,Mario
TI  - Introduction to semigroups
T2  - Merrill research and lecture series
SN  - 0675090628
AV  - QA171 .P43
U1  - 512/.2 
PY  - 1973///]
CY  - Columbus, Ohio
PB  - Merrill
KW  - Semigroups
KW  - Local
N1  - 920327; Bibliography: p. 183-194
ER  -