@article{RM_1971_26_3_a11,
     author = {Z. I. Kizner},
     title = {Families of planes in {Hilbert} space and developable surfaces},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     publisher = {mathdoc},
     volume = {26},
     number = {3},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1971_26_3_a11/}
}