TY - JOUR AU - Z. I. Kizner TI - Families of planes in Hilbert space and developable surfaces JO - Trudy Matematicheskogo Instituta imeni V.A. Steklova PY - 1971 VL - 26 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/RM_1971_26_3_a11/ LA - ru ID - RM_1971_26_3_a11 ER -