%0 Journal Article %A A. V. Arutyunov %T Necessary conditions for an extremum in an abnormal problem with equality constraints %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1990 %P 223-224 %V 45 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_1990_45_5_a8/ %G en %F RM_1990_45_5_a8