@article{MZM_2015_97_1_a6,
     author = {N. V. Ilyushechkin},
     title = {On an {Extremal} {Property} of {Normal} {Matrices}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {67--73},
     publisher = {mathdoc},
     volume = {97},
     number = {1},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2015_97_1_a6/}
}