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2. Notes on extensions of C*-algebras;Arveson;Duke Math. J.,1977
3. Closure of similarity orbits of nilpotent operators, I, Finite rank operators;Barrı́a;J. Operator Theory,1979
4. On closures of joint similarity orbits;Curto;Integral Equations Operator Theory,1985
5. Nonseparable approximate equivalence;Hadwin;Trans. Amer. Math. Soc.,1981