@article{ZNSL_2005_323_a5,
     author = {Kh. D. Ikramov and A. M. Nazari},
     title = {On the 2-norm distance from a~normal matrix to the set of matrices with a~multiple zero eigenvalue},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {50--56},
     publisher = {mathdoc},
     volume = {323},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2005_323_a5/}
}