49 citations · 289 across the 45 of their papers we have counts for
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math.SP2007★ 22 cited
On Approximation of the Eigenvalues of Perturbed Periodic Schrodinger Operators
Lyonell Boulton, Michael Levitin
This paper addresses the problem of computing the eigenvalues lying in the gaps of the essential spectrum of a periodic Schrodinger operator perturbed by a fast decreasing potentia…
math.SP2007
On the boundary of the pseudospectrum and its fault points
Lyonell Boulton, Peter Lancaster
The theme of this paper was motivated by the question: How effective are path-following procedures for tracing the pseudospectral boundary? The present study of the mathematical pr…