@article{10_37236_4823,
     author = {Michael Severino},
     title = {A construction of uniquely \(n\)-colorable digraphs with arbitrarily large digirth},
     journal = {The electronic journal of combinatorics},
     year = {2017},
     volume = {24},
     number = {2},
     doi = {10.37236/4823},
     zbl = {1361.05060},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/4823/}
}