@article{10_37236_3254,
     author = {Andrew Gainer-Dewar and Ira M. Gessel},
     title = {Enumeration of bipartite graphs and bipartite blocks},
     journal = {The electronic journal of combinatorics},
     year = {2014},
     volume = {21},
     number = {2},
     doi = {10.37236/3254},
     zbl = {1300.05129},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/3254/}
}