TY  - JOUR
AU  - Drbohlav, Karel
TI  - Concerning congruence relations on commutative semigroups (Preliminary communication)
JO  - Commentationes Mathematicae Universitatis Carolinae
PY  - 1963
SP  - 11
EP  - 13
VL  - 04
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/CMUC_1963__4_1_a1/
LA  - en
ID  - CMUC_1963__4_1_a1
ER  -