@article{105266, author = {Jaroslav Zem\'anek}, title = {Nowhere dense set which is finitely open}, journal = {Commentationes Mathematicae Universitatis Carolinae}, volume = {011}, year = {1970}, pages = {83-89}, zbl = {0195.40904}, mrnumber = {0261329}, language = {en}, url = {http://dml.mathdoc.fr/item/105266} }
Zemánek, Jaroslav. Nowhere dense set which is finitely open. Commentationes Mathematicae Universitatis Carolinae, Tome 011 (1970) pp. 83-89. http://gdmltest.u-ga.fr/item/105266/
Functional Analysis and Semigroups, Providence 1957. (1957)