TY  - JOUR
AU  - Lihová, Judita
TI  - The Lattice of all Systems of $r$-Ideals in a Set
JO  - Mathematica slovaca
PY  - 1972
SP  - 50
EP  - 58
VL  - 22
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MASLO_1972__22_1_a4/
LA  - en
ID  - MASLO_1972__22_1_a4
ER  -