@article{10_4064_cm119_2_8,
     author = {Stanis{\l}aw Ewert-Krzemieniewski},
     title = {Totally umbilical submanifolds in some
 {semi-Riemannian} manifolds},
     journal = {Colloquium Mathematicum},
     pages = {269--299},
     publisher = {mathdoc},
     volume = {119},
     number = {2},
     year = {2010},
     doi = {10.4064/cm119-2-8},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm119-2-8/}
}