@article{2248,
author = {Halfar, Edwin},
title = {The isolated points of a set},
journal = {Portugaliae mathematica},
volume = {13},
year = {1954},
pages = {125-128},
zbl = {0057.38703},
mrnumber = {0072457},
language = {en},
url = {http://dml.mathdoc.fr/item/2248}
}
Halfar, Edwin. The isolated points of a set. Portugaliae mathematica, Tome 13 (1954) pp. 125-128. http://gdmltest.u-ga.fr/item/2248/