@article{10_4153_S0008439520000910,
     author = {Ballesteros-Ch\'avez, Daniel and Klingenberg, Wilhelm and Lambert, Ben},
     title = {Prescribed k-symmetric curvature hypersurfaces in de {Sitter} space},
     journal = {Canadian mathematical bulletin},
     pages = {886--901},
     year = {2021},
     volume = {64},
     number = {4},
     doi = {10.4153/S0008439520000910},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/S0008439520000910/}
}