%0 Journal Article
%A Roger T. Lewis
%A Marcel Griesemer
%A Heinz Siedentop
%T A minimax principle for eigenvalues in spectral gaps: Dirac operators with Coulomb potentials.
%J Documenta mathematica
%D 1999
%P 275-283
%V 4
%U http://geodesic.mathdoc.fr/articles/10.4171/dm/61/
%R 10.4171/dm/61
%F 10_4171_dm_61