@article{10_37236_408,
     author = {David Eppstein},
     title = {Densities of minor-closed graph families},
     journal = {The electronic journal of combinatorics},
     year = {2010},
     volume = {17},
     doi = {10.37236/408},
     zbl = {1201.05085},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/408/}
}