%0 Journal Article %A E. R. Avakov %T Necessary conditions for a minimum for nonregular problems in Banach spaces. The maximum principle for abnormal optimal control problems %J Informatics and Automation %D 1988 %P 3-29 %V 185 %I mathdoc %U http://geodesic.mathdoc.fr/item/TRSPY_1988_185_a0/ %G ru %F TRSPY_1988_185_a0