TY  - DATA
AU  - M. Petrich
TI  - Rings and Semigroups
T2  - Lecture Notes in Mathematics
SN  - 9783540383147
PY  - 1974///
CY  - Heidelberg
PB  - Springer Berlin
KW  - Mathematics and Statistics
UR  - https://doi.org/10.1007/BFb0061470
ER  -