TY  - JOUR
AU  - Morgado, José
TI  - Some results on closure operators of partially ordered sets
JO  - Portugaliae mathematica
PY  - 1960
SP  - 101
EP  - 139
VL  - 19
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/PORMA_1960__19_2_114835/
LA  - en
ID  - PORMA_1960__19_2_114835
ER  -