@article{CMH_1956__30_139128,
     author = {John Milnor},
     title = {On the immersion of n-manifolds in (n+1)-space.},
     journal = {Commentarii mathematici Helvetici},
     pages = {275--284},
     publisher = {mathdoc},
     volume = {30},
     year = {1956},
     zbl = {0070.40202},
     url = {http://geodesic.mathdoc.fr/item/CMH_1956__30_139128/}
}