TY  - JOUR
AU  - Ježek, Jaroslav
TI  - The existence of upper semicomplements in lattices of primitive classes
JO  - Commentationes Mathematicae Universitatis Carolinae
PY  - 1971
SP  - 519
EP  - 532
VL  - 12
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/CMUC_1971__12_3_a4/
LA  - en
ID  - CMUC_1971__12_3_a4
ER  -