@article{DAN_1987_295_3_a11,
     author = {N. V. Pogorelov},
     title = {Diagonalization and simultaneous symmetrization of matrices in},
     journal = {Doklady Akademii Nauk},
     pages = {562--566},
     publisher = {mathdoc},
     volume = {295},
     number = {3},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_295_3_a11/}
}