Data up to Jan 2025
On the perturbation of continuous spectra
1948 • 524 citations
Asymptotic Expansions
2005 • 5 citations
Bounded Operators on Hilbert Spaces
2022 • 4 citations
On Approximation by Discrete Semigroups
1993 • 4 citations
Unbounded Operators on Hilbert Spaces
2020 • 3 citations