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This work was done during a sabbatical stay at the Tulane University in New Orleans, USA. I gratefully acknowledge the wonderful hospitality and helpful cooperation of J.A. Goldstein
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Nagel, R. Towards a “matrix theory” for unbounded operator matrices. Math Z 201, 57–68 (1989). https://doi.org/10.1007/BF01161994
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DOI: https://doi.org/10.1007/BF01161994