D. Luenberger, Observers for multivariable systems, IEEE Transactions on Automatic Control, vol.11, issue.2, pp.190-197, 1966.

D. Koenig, Observers design for unknown input nonlinear descriptor systems via convex optimization, IEEE Transactions on Automatic control, 2006.
URL : https://hal.archives-ouvertes.fr/hal-00135940

M. Darouach and L. Boutat-baddas, Observers for a class of nonlinear singular systems, IEEE Transactions on Automatic Control, 2008.
URL : https://hal.archives-ouvertes.fr/hal-00753125

F. Bejarano, A. Poznyak, and L. Fridman, Observer for linear time invariant systems with unknown inputs based on the hierarchical supertwisting concept, International Workshop on Variable Structure Systems, 2006. VSS'06, pp.208-213, 2006.

L. Fridman, A. Levant, and J. Davila, Observation of linear systems with unknown inputs via high-order sliding-modes, International Journal of systems science, vol.38, issue.10, pp.773-791, 2007.

D. Ichalal, B. Marx, J. Ragot, and D. Maquin, Unknown input observer for lpv systems with parameter varying output equation, IFAC-PapersOnLine, vol.48, issue.21, pp.1030-1035, 2015.

J. Qiu, K. Sun, T. Wang, and H. Gao, Observer-based fuzzy adaptive event-triggered control for pure-feedback nonlinear systems with prescribed performance, IEEE Transactions on Fuzzy Systems, 2019.

H. Bolandhemmat, C. Clark, and F. Golnaraghi, A solution to the state estimation problem of systems with unknown inputs, Recent Patents on Mechanical Engineering, 2012.

Y. Yanhua and Y. Zhibin, Revisiting the necessary condition for the existence of luenberger observer, Control Conference (CCC), 2015.

J. Yang, J. Su, S. Li, and X. Yu, High-order mismatched disturbance compensation for motion control systems via a continuous dynamic sliding-mode approach, IEEE Transactions on Industrial Informatics, 2014.

J. She, X. Xin, and Y. Pan, Equivalent-input-disturbance approachanalysis and application to disturbance rejection in dual-stage feed drive control system, IEEE/ASME Transactions on Mechatronics, vol.16, issue.2, pp.330-340, 2011.

K. Kalsi, J. Lian, S. Hui, and S. H. ?ak, Sliding-mode observers for systems with unknown inputs: A high-gain approach, Automatica, 2010.

T. Park and D. Kim, Design of unknown input observers for linear systems with unmatched unknown inputs, Transactions of the Institute of Measurement and Control, vol.36, issue.3, pp.399-410, 2014.

M. S. Chong, D. Ne?i?, R. Postoyan, and L. Kuhlmann, Parameter and state estimation of nonlinear systems using a multi-observer under the supervisory framework, IEEE Transactions on Automatic Control, 2015.
URL : https://hal.archives-ouvertes.fr/hal-01134640

J. Zhang and F. Zhu, Observer-based output consensus of a class of heterogeneous multi-agent systems with unmatched disturbances, Communications in Nonlinear Science and Numerical Simulation, 2018.

J. A. Moreno, E. Rocha-cózatl, and A. V. Wouwer, A dynamical interpretation of strong observability and detectability concepts for nonlinear systems with unknown inputs: application to biochemical processes, Bioprocess and biosystems engineering, vol.37, issue.1, pp.37-49, 2014.

P. A. Ioannou and J. Sun, Robust adaptive control, vol.1, 1996.

J. Löfberg, Yalmip: A toolbox for modeling and optimization in matlab, Proceedings of the CACSD Conference, vol.3, 2004.