@article{bwmeta1.element.bwnjournal-article-fmv57i1p11bwm, author = {J. Roberts}, title = {Zero-dimensional sets blocking connectivity functions}, journal = {Fundamenta Mathematicae}, volume = {57}, year = {1965}, pages = {173-179}, zbl = {0139.40603}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-fmv57i1p11bwm} }
Roberts, J. Zero-dimensional sets blocking connectivity functions. Fundamenta Mathematicae, Tome 57 (1965) pp. 173-179. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-fmv57i1p11bwm/