@article{IVM_1992_6_a1,
     author = {Yu. A. Aminov},
     title = {Three-dimensional saddle hypersurfaces with a~constant second symmetric function of principal curvatures},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {15--20},
     publisher = {mathdoc},
     number = {6},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1992_6_a1/}
}