TY  - JOUR
AU  - Pondělíček, Bedřich
TI  - On a certain relation for closure operation on a semigroup
JO  - Czechoslovak Mathematical Journal
PY  - 1970
SP  - 220
EP  - 231
VL  - 20
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1970.100962/
DO  - 10.21136/CMJ.1970.100962
LA  - en
ID  - 10_21136_CMJ_1970_100962
ER  -