@article {MR2212261,
	title = {On the robust stability of implicit linear systems containing a small parameter in the leading term},
	journal = {IMA J. Math. Control Inform.},
	volume = {23},
	number = {1},
	year = {2006},
	pages = {67{\textendash}84},
	issn = {0265-0754},
	doi = {10.1093/imamci/dni044},
	url = {http://db.lic.vnu.edu.vn:2080/10.1093/imamci/dni044},
	author = {Nguyen Huu Du and Linh, Vu Hoang}
}
