@article{ZNSL_2011_395_a1,
     author = {Yu. A. Al'pin and Kh. D. Ikramov},
     title = {A criterion for unitary congruence between complex matrices},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {9--19},
     publisher = {mathdoc},
     volume = {395},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2011_395_a1/}
}