1. K. Ammann, G. Teschl, Relative oscillation theory for Jacobi matrices, in Proceedings of the 14th International Conference on Difference Equations and Applications (Istanbul, 2008), ed. by M. Bohner, Z. Došlá, G. Ladas, M. Ünal, A. Zafer (Uğur-Bahçeşehir University Publishing Company, Istanbul, 2009), pp. 105–115
2. M. Bohner, O. Došlý, Disconjugacy and transformations for symplectic systems. Rocky Mt. J. Math. 27, 707–743 (1997)
3. M. Bohner, O. Došlý, W. Kratz, Sturmian and spectral theory for discrete symplectic systems. Trans. Am. Math. Soc. 361, 3019–3123 (2009)
4. O. Došlý, Oscillation theory of symplectic difference systems, in Advances in Discrete Dynamical Systems, Proceedings of the Eleventh International Conference on Difference Equations and Applications (Kyoto, 2006), ed. by S. Elaydi, K. Nishimura, M. Shishikura, N. Tose. Adv. Stud. Pure Math., Vol. 53 (Mathematical Society of Japan, Tokyo, 2009), pp. 41–50
5. O. Došlý, Relative oscillation of linear Hamiltonian differential systems. Math. Nachr. 290(14–15), 2234–2246 (2017)