Voir la notice de l'article provenant de la source Novi sad journal of mathematics website
@article{NSJOM_1987_17_1a_12, author = {Torga\v{s}ev Aleksandar}, title = {The spectrum of a normal digraph}, journal = {Novi Sad Journal of Mathematics}, pages = {187-200}, publisher = {mathdoc}, volume = {17}, number = {1}, year = {1987}, url = {http://geodesic.mathdoc.fr/item/NSJOM_1987_17_1a_12/} }
Torgašev Aleksandar. The spectrum of a normal digraph. Novi Sad Journal of Mathematics, Tome 17 (1987) no. 1. http://geodesic.mathdoc.fr/item/NSJOM_1987_17_1a_12/