HILSCHER, Roman and Viera RŮŽIČKOVÁ. Perturbation of nonnegative time scale quadratic functionals. In Difference Equations, Special Functions, and Orthogonal Polynomials. Londýn: World Scientific, 2007, p. 266-275. ISBN 978-981-270-643-0.
ADAMEC, Ladislav. Embedding of Linear Hamiltonian Systems on Small Time Scales. Dynamic Systems and Applications. Atlanta, USA: Dynamic Publishers,Inc., 2006, vol. 15, No 15, p. 351-356. ISSN 1056-2176.
DOŠLÝ, Ondřej. Transformations of linear Hamiltonian systems - continuous versus discrete. In Equadiff 9 Proceedings. Brno: Masaryk University, 1998, p. 49-61. ISBN 80-210-1940-9.