39 citations · 169 across the 20 of their papers we have counts for
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math-ph2010★ 3 cited
Simplicity of extremal eigenvalues of the Klein-Gordon equation
Mario Koppen, Christiane Tretter, Monika Winklmeier
We consider the spectral problem associated with the Klein-Gordon equation for unbounded electric potentials. If the spectrum of this problem is contained in two disjoint real inte…
math-ph2010★ 12 cited
On the spectrum of the magnetohydrodynamic mean-field alpha^2-dynamo operator
Uwe Guenther, Heinz Langer, Christiane Tretter
The existence of magnetohydrodynamic mean-field alpha^2-dynamos with spherically symmetric, isotropic helical turbulence function alpha is related to a non-self-adjoint spectral pr…