TY  - JOUR
AU  - J. Płonka
TI  - On sums of direct systems of Boolean algebras
JO  - Colloquium Mathematicum
PY  - 1969
SP  - 209
EP  - 214
VL  - 20
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/cm-20-2-209-214/
DO  - 10.4064/cm-20-2-209-214
LA  - en
ID  - 10_4064_cm_20_2_209_214
ER  -