@article {MR2837485,
	title = {Approximation of spectral intervals and leading directions for differential-algebraic equation via smooth singular value decompositions},
	journal = {SIAM J. Numer. Anal.},
	volume = {49},
	number = {5},
	year = {2011},
	pages = {1810{\textendash}1835},
	issn = {0036-1429},
	doi = {10.1137/100806059},
	url = {http://db.lic.vnu.edu.vn:2080/10.1137/100806059},
	author = {Linh, Vu Hoang and Mehrmann, Volker}
}
