@article{JRAM_1985__362_152776,
     author = {M. Klaus},
     title = {On coupling constant thresholds and related eigenvalue properties of {Dirac} operators.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {197--212},
     year = {1985},
     volume = {362},
     zbl = {0601.47003},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1985__362_152776/}
}