@article{ZNSL_2009_367_a4,
     author = {Kh. D. Ikramov and H. Fassbender},
     title = {Quadratically normal and congruence-normal matrices},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {45--66},
     publisher = {mathdoc},
     volume = {367},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2009_367_a4/}
}