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D. Bauer:
"Asymptotic Properties of subspace estimators";
Automatica, 41 (2005), 359 - 376.

Since the proposal of subspace methods in the eighties and early nineties
substantial efforts have been made in the analysis of the statistical
properties of the algorithms. This paper surveys the literature
on the asymptotic properties of particular subspace methods used for linear, dynamic, time
invariant, discrete time systems.
The goals of this
paper are threefold: First this survey tries to present the most relevant results on
the asymptotic properties of estimators obtained using subspace methods.
Secondly the main methods and tools that have been used
in the derivation of these results are presented to make the literature
more accessible. Thirdly
main unsolved questions and rewarding research topics are identified
some of which can be attacked using the toolbox discussed in the paper.

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC05937619