TY - JOUR AU - L. A. Masal'tsev TI - Nil-Manifolds Cannot be Immersed as Hypersurfaces in Euclidean Spaces JO - Matematičeskie zametki PY - 2004 SP - 868 EP - 873 VL - 76 IS - 6 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MZM_2004_76_6_a6/ LA - ru ID - MZM_2004_76_6_a6 ER -