TY  - JOUR
AU  - G. Grätzer
AU  - J. Płonka
TI  - A characterization of semilattices
JO  - Colloquium Mathematicum
PY  - 1970
SP  - 21
EP  - 24
VL  - 22
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/cm-22-1-21-24/
DO  - 10.4064/cm-22-1-21-24
LA  - en
ID  - 10_4064_cm_22_1_21_24
ER  -