@article{IM2_1996_60_1_a1,
     author = {A. V. Arutyunov},
     title = {Second-order conditions in extremal problems with finite-dimensional range. 2-normal maps},
     journal = {Izvestiya. Mathematics},
     pages = {39--65},
     year = {1996},
     volume = {60},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1996_60_1_a1/}
}