1. On the observability of linear time-invariant systems with unknown inputs;Basile;Journal of Optimization Theory and Applications,1969
2. A new characterization of some structural properties of linear systems: unknown-input observability, invertibility and functional controllability;Basile;Journal of Optimization Theory and Applications,1973
3. G. Basile and G. Marro. Controlled and Conditioned Invariants in Linear System Theory. Prentice Hall, Englewood Cliffs, New Jersey, 1992.
4. Observer design for linear systems with unknown inputs;Bhattacharyya;IEEE Transactions on Automatic Control,1978
5. D. Carnevale, S. Galeani, L. Menini, and M. Sassano. Output regulation of hybrid linear systems with unpredictable jumps. In 19th IFAC World Conference, pages 1531-1536, Cape Town, South Africa, 2014.