@article {MR2415967,
	title = {Stability radii of differential algebraic equations with structured perturbations},
	journal = {Systems Control Lett.},
	volume = {57},
	number = {7},
	year = {2008},
	pages = {546{\textendash}553},
	issn = {0167-6911},
	doi = {10.1016/j.sysconle.2007.12.001},
	url = {http://db.lic.vnu.edu.vn:2080/10.1016/j.sysconle.2007.12.001},
	author = {Nguyen Huu Du}
}
