@article{article1c0394a9,
title   = {Change of the *congruence canonical form of 2-by-2 matrices under perturbations},
author = {Futorny, Vyacheslav and Klimenko, Lena and Sergeichuk, Vladimir V},
year = {2014},
doi = {10.13001/1081-3810.1608},
journal   = {Electronic Journal of Linear Algebra}
}