@article{IVM_1968_2_a1,
     author = {I. A. Bernadskii and R. A. Minlos},
     title = {The defect indices of symmetric {Jacobian} matrices},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {16--20},
     publisher = {mathdoc},
     number = {2},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1968_2_a1/}
}