@article{10_1017_S0017089501010126,
     author = {Cao, Xi-Fang},
     title = {Pseudo-umbilical submanifolds of constant curvature {Riemannian} manifolds},
     journal = {Glasgow mathematical journal},
     pages = {129--133},
     year = {2001},
     volume = {43},
     number = {1},
     doi = {10.1017/S0017089501010126},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089501010126/}
}