@article{DOCMA_1999__4__a10,
     author = {Griesemer, Marcel and Lewis, Roger T. and Siedentop, Heinz},
     title = {A minimax principle for eigenvalues in spectral gaps: {Dirac} operators with {Coulomb} potentials.},
     journal = {Documenta mathematica},
     pages = {275--283},
     publisher = {mathdoc},
     volume = {4},
     year = {1999},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DOCMA_1999__4__a10/}
}