1. Deterministic and stochastic linear periodic systems;Bittanti,1986
2. Colaneri, P. (1990). Discrete-time linear periodic systems: stabilization and zero error regulation, Preprints of the 11th IFAC Worl Congress, Tallinn, Estonia (SU), 2, 144–149.
3. Robust control of a general servomechanism problem: the servo compensator;Davison;Automatica,1975
4. Linear time-invariant robust servomechanism problem: a self-contained exposition;Desoer,1980
5. Finite-dimensional realizations of discrete-time weighting patterns;Evans;SIAM Appl. Math.,1972