TY  - BOOK
AU  - Petrich,Mario
TI  - Rings and semigroups
T2  - Lecture notes in mathematics
SN  - 0387067302
PY  - 1974///
CY  - Berlin, New York
PB  - Springer-Verlag
KW  - Semigroups
KW  - Associative rings
N1  - Bibliography: p. 168-174
ER  -