@article{10_37236_498,
     author = {Tobias M\"uller and Attila P\'or and Jean-S\'ebastien Sereni},
     title = {Graphs with four boundary vertices},
     journal = {The electronic journal of combinatorics},
     year = {2011},
     volume = {18},
     number = {1},
     doi = {10.37236/498},
     zbl = {1205.05194},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/498/}
}