Geodesic
Families of planes in Hilbert space and developable surfaces
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 26 (1971) no. 3 
Z. I. Kizner. Families of planes in Hilbert space and developable surfaces. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 26 (1971) no. 3. http://geodesic.mathdoc.fr/item/RM_1971_26_3_a11/
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     author = {Z. I. Kizner},
     title = {Families of planes in {Hilbert} space and developable surfaces},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     year = {1971},
     volume = {26},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1971_26_3_a11/}
}
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[1] N. I. Akhiezer, I. M. Glazman, Teoriya lineinykh operatorov v gilbertovom prostranstve, «Nauka», M., 1966 | MR | Zbl