%0 Journal Article %A Frehse, Jens %A Specovius-Neugebauer, Maria %T Fractional Interior Differentiability of the Stress Velocities to Elastic Plastic Problems with Hardening %J Bollettino della Unione matematica italiana %D 2012 %P 469-494 %V 5 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/BUMI_2012_9_5_3_a1/ %G en %F BUMI_2012_9_5_3_a1