@article{IVM_1983_8_a3,
     author = {V. I. Kazimirov and V. I. Plotnikov and I. M. Starobinets},
     title = {A~necessary condition for an extremum in smooth problems with operator constraints},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {21--26},
     publisher = {mathdoc},
     number = {8},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1983_8_a3/}
}