@article{10_37236_827,
     author = {Stefan Gr\"unewald and Peter J. Humphries and Charles Semple},
     title = {Quartet compatibility and the quartet graph},
     journal = {The electronic journal of combinatorics},
     year = {2008},
     volume = {15},
     doi = {10.37236/827},
     zbl = {1180.05074},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/827/}
}