%0 Journal Article %A Nazari-Moghaddam, Sakineh %A Chellali, Mustapha %T A New Upper Bound for the Perfect Italian Domination Number of a Tree %J Discussiones Mathematicae. Graph Theory %D 2022 %P 1005-1022 %V 42 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DMGT_2022_42_3_a19/ %G en %F DMGT_2022_42_3_a19