TY  - JOUR
AU  - Juris Steprans
AU  - Stephen Watson
TI  - Destroying precaliber $ℵ_1$: an application of a Δ-systems lemma for closed sets
JO  - Fundamenta Mathematicae
PY  - 1988
SP  - 223
EP  - 229
VL  - 129
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/fm-129-3-223-229/
DO  - 10.4064/fm-129-3-223-229
LA  - en
ID  - 10_4064_fm_129_3_223_229
ER  -