@article{JRAM_1989__394_153104,
     author = {Arne Jensen},
     title = {Perturbation results for {Stark} effect resonances.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {168--179},
     publisher = {mathdoc},
     volume = {394},
     year = {1989},
     zbl = {0655.35061},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1989__394_153104/}
}