%0 Journal Article %A Yu. S. Ledyaev %A J. S. Treiman %T Sub- and supergradients of envelopes, semicontinuous closures, and limits of sequences of functions %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 2012 %P 345-373 %V 67 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_2012_67_2_a4/ %G en %F RM_2012_67_2_a4