TY  - JOUR
AU  - Kolli, Messaoud
TI  - Direct and elementary approach to enumerate topologies on a finite set
JO  - Journal of integer sequences
PY  - 2007
VL  - 10
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/JIS_2007__10_3_a6/
LA  - en
ID  - JIS_2007__10_3_a6
ER  -