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 discrete symplectic matrix systems;Anderson;Dynam. Systems Appl.,1999
4. Linear Hamiltonian difference systems: disconjugacy and Jacobi-type conditions;Bohner;J. Math. Anal. Appl.,1996
5. Disconjugacy and transformations for symplectic systems;Bohner;Rocky Mountain J. Math.,1997