Key points are not available for this paper at this time.
B. V. Hamon, E. J. Hannan, Spectral Estimation of Time Delay for Dispersive and Non-Dispersive Systems, Journal of the Royal Statistical Society. Series C (Applied Statistics), Vol. 23, No. 2 (1974), pp. 134-142
Hamon et al. (Tue,) studied this question.