@article{IVM_1981_8_a9,
     author = {V. M. Shashkov},
     title = {An existence theorem for an extremal problem in {a~Hilbert} space},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {52--54},
     publisher = {mathdoc},
     number = {8},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1981_8_a9/}
}