@article{MZM_2009_86_5_a13,
     author = {Shichang Shu and Annie Yi Han},
     title = {Nonnegative {Sectional} {Curvature} {Hypersurfaces} in a {Real} {Space} {Form}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {776--793},
     publisher = {mathdoc},
     volume = {86},
     number = {5},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2009_86_5_a13/}
}