TY  - JOUR
AU  - Petrich, Mario
TI  - Semigroups certain of whose subsemigroups have identities
JO  - Czechoslovak Mathematical Journal
PY  - 1966
SP  - 186
EP  - 198
VL  - 16
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1966.100723/
DO  - 10.21136/CMJ.1966.100723
LA  - en
ID  - 10_21136_CMJ_1966_100723
ER  -