@article{IVM_1997_2_a2,
     author = {B. M. Darinskii and Yu. I. Sapronov},
     title = {Bifurcations of extremals near a singularity of a multidimensional fold},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {35--46},
     publisher = {mathdoc},
     number = {2},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1997_2_a2/}
}