TY  - JOUR
AU  - Chvalina, Jan
TI  - Isomorphic algebraic pre-closures and equivalent set-systems
JO  - Archivum mathematicum
PY  - 1977
SP  - 141
EP  - 147
VL  - 13
IS  - 3
UR  - http://geodesic.mathdoc.fr/item/ARM_1977_13_3_a2/
LA  - en
ID  - ARM_1977_13_3_a2
ER  -