%0 Journal Article %A J.Jagan Mohan %T Variation of parameters for nabla fractional difference equations %J Novi Sad Journal of Mathematics %D 2014 %P 149-159 %V 44 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/NSJOM_2014_44_2a_11/ %F NSJOM_2014_44_2a_11