TY - JOUR AU - A. V. Arutyunov TI - Implicit function theorem as a~realization of the~Lagrange principle. Abnormal points JO - Sbornik. Mathematics PY - 2000 SP - 1 EP - 24 VL - 191 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/SM_2000_191_1_a0/ LA - en ID - SM_2000_191_1_a0 ER -