  In this paper, an original result in terms of a sufficient condition to test
identifiability of nonlinear delayed-differential models with constant delays
and multi-inputs is given. The identifiability is studied for the linearized
system and a criterion for linear systems with constant delays is provided,
from which the identifiability of the original nonlinear system can be proved.
This result is obtained by combining a classical identifiability result for
nonlinear ordinary differential systems due to M.S. Grewal and K. Glover (1976)
with the identifiability of linear delayed-differential models developed by Y.
Orlov et al. (2002). This paper is a generalization of the results provided by
L. Denis-Vidal, C. Jauberthie, G. Joly-Blanchard (2006), which deal with the
specific case of nonlinear delayed-differential models with two delays and a
single input.
