@article{FPM_2014_19_4_a4,
     author = {A. D. Ioffe},
     title = {On necessary conditions for a~minimum},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {121--152},
     year = {2014},
     volume = {19},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2014_19_4_a4/}
}