@article{bwmeta1.element.bwnjournal-article-fmv75i1p19bwm,
author = {W\l adys\l aw Wilczy\'nski},
title = {On the family of sets of approximate limit numbers},
journal = {Fundamenta Mathematicae},
volume = {75},
year = {1972},
pages = {169-174},
zbl = {0212.08601},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-fmv75i1p19bwm}
}
Wilczyński, Władysław. On the family of sets of approximate limit numbers. Fundamenta Mathematicae, Tome 75 (1972) pp. 169-174. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-fmv75i1p19bwm/