@article{DMGT_2013_33_2_a0,
     author = {Hern\'andez-Cruz, C\'esar},
     title = {4-Transitive {Digraphs} {I:} {The} {Structure} of {Strong} {4-Transitive} {Digraphs}},
     journal = {Discussiones Mathematicae. Graph Theory},
     pages = {247--260},
     publisher = {mathdoc},
     volume = {33},
     number = {2},
     year = {2013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGT_2013_33_2_a0/}
}