@article{10_37236_1142,
     author = {Fan Chung},
     title = {The diameter and {Laplacian} eigenvalues of directed graphs},
     journal = {The electronic journal of combinatorics},
     year = {2006},
     volume = {13},
     doi = {10.37236/1142},
     zbl = {1084.05031},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/1142/}
}