@article{DAN_1961_139_4_a0,
     author = {Yu. P. Ginzburg},
     title = {Projection in a {Hilbert} space with bilinear metric},
     journal = {Doklady Akademii Nauk},
     pages = {775--778},
     publisher = {mathdoc},
     volume = {139},
     number = {4},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1961_139_4_a0/}
}