TY  - JOUR
AU  - Hill, Paul
TI  - Concerning anti-closed subsets in semigroups
JO  - Portugaliae mathematica
PY  - 1967
SP  - 193
EP  - 200
VL  - 26
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/PORMA_1967__26_2_115018/
LA  - en
ID  - PORMA_1967__26_2_115018
ER  -