@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/}
}