@article{10_37236_114,
     author = {Alexander L. Churchill},
     title = {Restrictions and generalizations on comma-free codes},
     journal = {The electronic journal of combinatorics},
     year = {2009},
     volume = {16},
     number = {1},
     doi = {10.37236/114},
     zbl = {1160.94017},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/114/}
}