%0 Journal Article %A Irena M. Jovanović %T Non-negative spectrum of a digraph %J Ars Mathematica Contemporanea %D 2017 %P 167-182 %V 12 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.26493/1855-3974.682.065/ %R 10.26493/1855-3974.682.065 %G en %F 10_26493_1855_3974_682_065