@article{700662,
title = {The limit inferior of a filtered set-family as a set of limit points},
booktitle = {General topology and its relations to modern analysis and algebra IV},
series = {GDML\_Books},
publisher = {Society of Czechoslovak Mathematicians and Physicist},
address = {Praha},
year = {1977},
pages = {149-153},
mrnumber = {MR0487945},
zbl = {0375.54002},
url = {http://dml.mathdoc.fr/item/700662}
}
Grimeisen, G. The limit inferior of a filtered set-family as a set of limit points, dans General topology and its relations to modern analysis and algebra IV, GDML_Books, (1977), pp. 149-153. http://gdmltest.u-ga.fr/item/700662/