1. A. Varga, On periodic linear matrix equations: Applications, new algorithms and software, in: Proc. Householder Symposium XIII, Pontresina, Switzerland, 17.-21.06.1996, pp. 206–209.
2. Periodic Systems: Filtering and Control;Bittanti,2009
3. Invariant representations of discrete-time periodic systems;Bittanti;Automatica,2000
4. Model reduction of periodic systems: a lifting approach;Farhood;Automatica,2005
5. A periodic systems toolbox for MATLAB;Varga,2005