MathSciNet bibliographic data MR1243265 (94i:46071) 46L05 (47A10 47B15 47B37) Arveson, William Improper filtrations for \$C\sp *\$$C\sp *$-algebras: spectra of unilateral tridiagonal operators. Acta Sci. Math. (Szeged) 57 (1993), no. 1-4, 11–24. Journal

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