1. The concept of spectral dichotomy for linear difference equations,;B. Aulbach;\emph{J. Math. Anal. Appl.},1994
2. A spectral theory for nonautonomous difference equations,;B. Aulbach;in \emph{New Trends in Difference Equations,2002
3. The dichotomy spectrum for noninvertible systems of linear difference equations,;B. Aulbach;\emph{J. Difference Equ. Appl.},2001
4. Criteria for exponential dichotomy for triangular systems,;F. Battelli;\emph{J. Math. Anal. Appl.},2015
5. Almost reducible system of differential equations,;B. F. Bylov;\emph{Sibirsk. Mat. Zh.},1963