%0 Journal Article %A Vladica Andrejić %T Strong duality principle for four-dimensional Osserman manifolds %J Kragujevac Journal of Mathematics %D 2010 %P 17 - 28 %V 33 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/KJM_2010_33_1_a1/ %F KJM_2010_33_1_a1