An algorithm for computing the distance to uncontrollability
In: Systems & Control Letters, Jg. 17 H. 6, S. 453-464
Minimizing the condition number of a positive definite matrix by completion
In: Numerische Mathematik, Jg. 69 H. 1, S. 17-23Perturbation and interlace theorems for the unitary eigenvalue problem
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