TY  - JOUR
AU  - L. Szczerba
TI  - The notion of an elementary subsystem for a Boolean-valued relational system
JO  - Fundamenta Mathematicae
PY  - 1973
SP  - 5
EP  - 12
VL  - 80
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/fm-80-1-5-12/
DO  - 10.4064/fm-80-1-5-12
LA  - en
ID  - 10_4064_fm_80_1_5_12
ER  -