@article{DAN_1984_274_3_a0,
     author = {V. N. Vorobjev},
     title = {An approach to the representation of a digraph in algebraic form},
     journal = {Doklady Akademii Nauk},
     pages = {521--524},
     year = {1984},
     volume = {274},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1984_274_3_a0/}
}