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To P. R. Halmos on the occasion of his 75th birthday.
Research supported in part by NSF grant DMS 89-12362.
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Voiculescu, D. Around quasidiagonal operators. Integr equ oper theory 17, 137–149 (1993). https://doi.org/10.1007/BF01322551
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DOI: https://doi.org/10.1007/BF01322551