@article{05138323,
title = {Direct and elementary approach to enumerate topologies on a finite set.},
journal = {Journal of Integer Sequences [electronic only]},
volume = {10},
year = {2007},
zbl = {1113.05007},
language = {en},
url = {http://dml.mathdoc.fr/item/05138323}
}
Kolli, Messaoud. Direct and elementary approach to enumerate topologies on a finite set.. Journal of Integer Sequences [electronic only], Tome 10 (2007) . http://gdmltest.u-ga.fr/item/05138323/