Approximately Invariant Subspaces for Unbounded Linear Operators. II.
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Palle E.T. Jorgensen (1977)
Mathematische Annalen
C.K. Chui, P.W. Smith, J.D. Ward (1975)
Mathematische Zeitschrift
Laurent Veron, Abdelilah Gmira (1982)
Monatshefte für Mathematik
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