@article{MZ_1978__160_172663,
     author = {Werner Stork},
     title = {Regularity and {Decay} of {Eigenfunctions.}},
     journal = {Mathematische Zeitschrift},
     pages = {51--62},
     year = {1978},
     volume = {160},
     zbl = {0359.47027},
     url = {http://geodesic.mathdoc.fr/item/MZ_1978__160_172663/}
}