1. Stability and Asymptotic Behavior of Differential Equations;Coppel,1965
2. A method for asymptotic integration of almost diagonal systems;Elias;Asymptotic Anal.,2002
3. A framework for asymptotic integration of differential system;Elias;Asymptotic Anal.,2003
4. Asymptotic Expansions;Erdélyi,1956
5. The Asymptotic Solution of Linear Differential System;Eastham,1989