Dřímalová Iva and Hilscher Roman Šimon: Antiprincipal solutions at infinity for symplectic systems on time scales. (2020)
Hilscher Roman Šimon: Asymptotic properties of solutions of Riccati matrix equations and inequalities for discrete symplectic systems. (2015)
Hilscher Roman Šimon and Zeidan Vera: Rayleigh principle for time sclaes symplectic systems and applications. (2011)