@article{DE_2001_37_1_a16,
     author = {V. I. Maksimov},
     title = {An {Extremal} {Problem} in a {Hilbert} {Space}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {126--127},
     publisher = {mathdoc},
     volume = {37},
     number = {1},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2001_37_1_a16/}
}