S. I. Niculescu, Delay effects on stability, A robust control approach, 2001.

M. Malek-zavarei and M. Jamshidi, Time delay systems: analysis, optimization and applications, 1987.

J. K. Hale and S. M. Lunel, Introduction to functional differential equations, 1993.
DOI : 10.1007/978-1-4612-4342-7

A. E. Pearson and Y. A. Fiagbedzi, An observer for time lag systems, Ac-13, pp.775-777, 1989.
DOI : 10.1109/9.29412

J. Leyva-ramos and A. E. Pearson, An asymptotic modal observer for linear autonomous time lag systems, IEEE Transactions on Automatic Control, vol.40, issue.7, pp.1291-1294, 1995.
DOI : 10.1109/9.400473

M. Darouach, Linear functional observers for systems with delays in state variables, IEEE Transactions on Automatic Control, vol.46, issue.3, pp.491-496, 2001.
DOI : 10.1109/9.911430

M. Darouach, P. Pierrot, and E. Richard, Design of reduced-order observers without internal delays, IEEE Transactions on Automatic Control, vol.44, issue.9, pp.1711-1714, 1999.
DOI : 10.1109/9.788537

M. Darouach, M. Zasadzinski, and S. J. Xu, Full-order observers for linear systems with unknown inputs, IEEE Transactions on Automatic Control, vol.39, issue.3, pp.606-609, 1994.
DOI : 10.1109/9.280770
URL : https://hal.archives-ouvertes.fr/hal-00098125

A. Fattouh, O. Sename, and J. M. Dion, An unknown input observer design for linear time-delay systems, Proceedings of the 38th IEEE Conference on Decision and Control (Cat. No.99CH36304), pp.4222-4227, 1999.
DOI : 10.1109/CDC.1999.828024

O. Sename, Unknown input robust observers for time-delay systems, Proceedings of the 36th IEEE Conference on Decision and Control, pp.1629-1630, 1997.
DOI : 10.1109/CDC.1997.657743

O. Sename, A. Fattouh, and J. M. Dion, Further results on unknown input observers design for time-delay systems, Proceedings of the 40th IEEE Conference on Decision and Control (Cat. No.01CH37228), pp.4635-4636, 2001.
DOI : 10.1109/CDC.2001.980936

C. R. Rao and S. K. Mitra, Generalized inverse of matrices and its applications, 1971.

Y. M. Fu, G. Duan, and S. M. Song, Design of unknown input observer for linear time-delay systems, International journal of control, automation, and syst, vol.2, issue.4, pp.530-535, 2004.