@article{10_1017_S0017089504002137,
     author = {BARBOSA, JOS\'E N.},
     title = {HYPERSURFACES {OF} ${\mathbb S}^{n+1}$ {WITH} {TWO} {DISTINCT} {PRINCIPAL} {CURVATURES}},
     journal = {Glasgow mathematical journal},
     pages = {149--153},
     year = {2005},
     volume = {47},
     number = {1},
     doi = {10.1017/S0017089504002137},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089504002137/}
}