TY  - JOUR
AU  - Ellis, David
TI  - An algebraic characterization of lattices among semilattices
JO  - Portugaliae mathematica
PY  - 1949
SP  - 103
EP  - 106
VL  - 8
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/PORMA_1949__8_2_114678/
LA  - en
ID  - PORMA_1949__8_2_114678
ER  -