@article{01509533,
title = {Degrees, neighbourhoods and closure operations.},
journal = {Acta Mathematica Universitatis Comenianae. New Series},
volume = {69},
year = {2000},
pages = {71-76},
zbl = {0958.05073},
language = {en},
url = {http://dml.mathdoc.fr/item/01509533}
}
Stacho, L. Degrees, neighbourhoods and closure operations.. Acta Mathematica Universitatis Comenianae. New Series, Tome 69 (2000) pp. 71-76. http://gdmltest.u-ga.fr/item/01509533/