1. Quadratic functionals for second-order matrix equations on time scales;Agarwal;Nonlinear Anal.,1998
2. Basic calculus on time scales and some of its applications;Agarwal;Results Math.,1999
3. Sturm–Liouville eigenvalue problems on time scales;Agarwal;Appl. Math. Comput.,1999
4. Discrete Hamiltonian Systems: Difference Equations, Continued Fractions, and Riccati Equations;Ahlbrandt,1996
5. B. Aulbach, S. Hilger, Linear dynamic processes with inhomogeneous time scale, in: Nonlinear Dynamics and Quantum Dynamical Systems, Gaussig, 1990. Vol. 59 of Math. Res., Akademie Verlag, Berlin, 1990, pp. 9–20.