@article {MR2057198,
	title = {Connections between implicit difference equations and differential-algebraic equations},
	journal = {Acta Math. Vietnam.},
	volume = {29},
	number = {1},
	year = {2004},
	pages = {23{\textendash}39},
	issn = {0251-4184},
	author = {Pham Ky Anh and Nguyen Huu Du and Le Cong Loi}
}
