%0 Journal Article %A A. V. Arutyunov %T Implicit function theorem as a~realization of the~Lagrange principle. Abnormal points %J Sbornik. Mathematics %D 2000 %P 1-24 %V 191 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_2000_191_1_a0/ %G en %F SM_2000_191_1_a0