1. D.D. Lee, R. L. Kashyap, and R. N. Madan, Robust decentralized direction-of-arrival estimation in contaminated noise,IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-38, pp. 496?505, March 1990.
2. B.E. Ottersten, Parametric subspace fitting methods for array signal processing, Ph.D. dissertation, Stanford University, Stanford, CA, December 1989.
3. U. Sandk�hler and J. F. B�hme, Accuracy of maximum likelihood estimates for array processing,Proc. IEEE International Conference on Acoustics, Speech, and Signal Processing, Dallas, TX, pp. 2015?2018, April 1987.
4. R.O. Schmidt, A signal subspace approach to multiple emitter location and spectral estimation, Ph.D. dissertation, Stanford University, Stanford, CA, November 1981.
5. T. S�derstr�m and P. Stoica,System Identification, Prentice-Hall International, London, 1989.