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Douglas, R.G., Pearcy, C. (1973). Invariant subspaces of non-quasitriangular operators. In: Fillmore, P.A. (eds) Proceedings of a Conference on Operator Theory. Lecture Notes in Mathematics, vol 345. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0058916
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DOI: https://doi.org/10.1007/BFb0058916
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