1. Discrete Hamiltonian Systems: Difference Equations, Continued Fractions, and Riccati Equations;Ahlbrandt,1996
2. Discrete trigonometric matrix functions;Anderson;Panamer. Math. J.,1997
3. Normalized prepared bases for symplectic matrix systems;Anderson;Dynam. Systems Appl.,1999
4. A Prüfer transformation for matrix differential equations;Barrett;Proc. Amer. Math. Soc.,1957
5. Linear Hamiltonian difference systems: disconjugacy and Jacobi-type conditions;Bohner;J. Math. Anal. Appl.,1996