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3. An implementation of a divide and conquer algorithm for the unitary eigenproblem;Ammar;ACM Trans. Math. Software,1992
4. A bound for the spectral variation of a unitary operator;Bhatia;Linear Multilinear Algebra,1984
5. Beiträge zur numerischen Behandlung des unitären Eigenwertproblems;Bohnhorst,1993