%0 Journal Article %A V. V. Goncharov %A F. F. Pereira %T Neighbourhood Retractions of Nonconvex Sets in a Hilbert Space via Sublinear Functionals %J Journal of convex analysis %D 2011 %P 1-36 %V 18 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/JCA_2011_18_1_JCA_2011_18_1_a0/ %F JCA_2011_18_1_JCA_2011_18_1_a0