Picone type identities and definiteness of quadratic functionals on time scales. - Roman Simon Hilscher; Vera Zeidan (Appl. Math. Comput., 2009)

First order conditions for generalized variational problems over time scales. - Roman Simon Hilscher; Vera Zeidan (Comput. Math. Appl., 2011)

Eigenvalue theory for time scale symplectic systems depending nonlinearly on spectral parameter. - Roman Simon Hilscher (Appl. Math. Comput., 2012)

Oscillation theorems and Rayleigh principle for linear Hamiltonian and symplectic systems with general boundary conditions. - Roman Simon Hilscher; Vera Zeidan (Appl. Math. Comput., 2012)

A Generalized Index Theorem for Monotone Matrix-Valued Functions with Applications to Discrete Oscillation Theory. - W. Kratz; Roman Simon Hilscher (SIAM J. Matrix Anal. Appl., 2013)

Limit point and limit circle classification for symplectic systems on time scales. - Roman Simon Hilscher; Petr Zemánek (Appl. Math. Comput., 2014)