@article{SM_2005_196_9_a0,
     author = {E. R. Avakov and A. V. Arutyunov},
     title = {Inverse function theorem and conditions of extremum for abnormal problems with non-closed range},
     journal = {Sbornik. Mathematics},
     pages = {1251--1269},
     year = {2005},
     volume = {196},
     number = {9},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2005_196_9_a0/}
}