TY  - JOUR
AU  - Pondělíček, Bedřich
TI  - A certain equivalence on a semigroup
JO  - Czechoslovak Mathematical Journal
PY  - 1971
SP  - 109
EP  - 117
VL  - 21
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1971.101006/
DO  - 10.21136/CMJ.1971.101006
LA  - en
ID  - 10_21136_CMJ_1971_101006
ER  -