@article{02171954,
title = {On the number of matroids on a finite set.},
journal = {S\'eminaire Lotharingien de Combinatoire [electronic only]},
volume = {52},
year = {2004},
zbl = {1061.05020},
language = {en},
url = {http://dml.mathdoc.fr/item/02171954}
}
Dukes, W.M.B. On the number of matroids on a finite set.. Séminaire Lotharingien de Combinatoire [electronic only], Tome 52 (2004) . http://gdmltest.u-ga.fr/item/02171954/