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G.S. Ammar, W.B. Gragg and L. Reichel, On the eigenproblem for orthogonal matrices. In: Proceedings of the 25th Conference on Decision and Control, IEEE, New York, pp 1063--1066, 1986.
G.S. Ammar, W.B. Gragg and L. Reichel, Determination of Pisarenko frequency estimates as eigenvalues of an orthogonal matrix. In: F.T. Luk (Ed.), Advanced Algorithms and Architectures for Signal Processing II, Proc. SPIE 826, pp 143--145, 1987.
G.S. Ammar, W.B. Gragg and L. Reichel, Constructing a unitary Hessenberg matrix from spectral data. In: G.H. Golub and P. Van Dooren (Eds.), Numerical Linear Algebra, Digital Signal Processing and Parallel Algorithms, Springer, New York, pp 385--396, 1991.
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G.S. Ammar, L. Reichel, and D.C. Sorensen, An implementation of a divide and conquer algorithm for the unitary eigenproblem. ACM Trans. Math. Software, to appear.
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T.-L. Wang, Convergence of the QR Algorithm with Origin Shifts for Real Symmetric Tridiagonal and Unitary Hessenberg Matrices. Ph.D. Dissertation, Dept. of Mathematics, University of Kentucky, Lexington, KY, 1988.

Greg Ammar
Sun Feb 12 23:42:52 CST 1995