@article{10_37236_574,
     author = {Alice Paul and Nicholas Pippenger},
     title = {A census of vertices by generations in regular tessellations of the plane},
     journal = {The electronic journal of combinatorics},
     year = {2011},
     volume = {18},
     number = {1},
     doi = {10.37236/574},
     zbl = {1217.05031},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/574/}
}