  Recently, M. Mitkovski gave a criterion for the basicity of a sequence of
complex exponentials in terms of the invertibility properties of a certain
naturally associated Toeplitz operator, in the spirit of the celebrated work of
Khrushchev-Nikolski-Pavlov. In our paper, we extend the results of Mitkovski to
model spaces associated with meromorphic inner functions and we also give an
analogue for the property of being an asymptotically orthonormal basis.
