@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/