%0 Journal Article %A Milanka Gardašević Filipović %T A Trust Region Method Using Subgradient for Minimizing a Nondifferentiable Function %J Yugoslav journal of operations research %D 2009 %P 249 %V 19 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/YJOR_2009_19_2_a3/ %G en %F YJOR_2009_19_2_a3