@article{10_4064_fm_129_3_223_229,
     author = {Juris Steprans and Stephen Watson},
     title = {Destroying precaliber $\ensuremath{\aleph}_1$: an application of a {\ensuremath{\Delta}-systems} lemma for closed sets},
     journal = {Fundamenta Mathematicae},
     pages = {223--229},
     publisher = {mathdoc},
     volume = {129},
     number = {3},
     year = {1988},
     doi = {10.4064/fm-129-3-223-229},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-129-3-223-229/}
}