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The joint essential numerical range, compact perturbations, and the Olsen problem
- 1.MÜLLER, Vladimír. The joint essential numerical range, compact perturbations, and the Olsen problem. Studia mathematica. 2010, 197(3), 275-290. ISSN 0039-3223. E-ISSN 1730-6337. Available: doi: 10.4064/sm197-3-5.
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