Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_1992_51_2_a10, author = {Yu. A. Nikolaevskii}, title = {Extrinsic spheres in a symmetric space}, journal = {Matemati\v{c}eskie zametki}, pages = {72--76}, publisher = {mathdoc}, volume = {51}, number = {2}, year = {1992}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1992_51_2_a10/} }
Yu. A. Nikolaevskii. Extrinsic spheres in a symmetric space. Matematičeskie zametki, Tome 51 (1992) no. 2, pp. 72-76. http://geodesic.mathdoc.fr/item/MZM_1992_51_2_a10/