@article{MZM_2004_76_6_a6,
     author = {L. A. Masal'tsev},
     title = {Nil-Manifolds {Cannot} be {Immersed} as {Hypersurfaces} in {Euclidean} {Spaces}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {868--873},
     publisher = {mathdoc},
     volume = {76},
     number = {6},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2004_76_6_a6/}
}