%0 Journal Article %A Chellali, Mustapha %A Haynes, Teresa %A Randerath, Bert %A Volkmann, Lutz %T Bounds on the global offensive k-alliance number in graphs %J Discussiones Mathematicae. Graph Theory %D 2009 %P 597-613 %V 29 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DMGT_2009_29_3_a10/ %G en %F DMGT_2009_29_3_a10