@article{ZNSL_2003_303_a6,
     author = {N. V. Ilyushechkin},
     title = {On some identities for the elements of a~symmetric matrix},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {119--144},
     year = {2003},
     volume = {303},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2003_303_a6/}
}