@article{MAN_1940__117_160044,
     author = {G. Doetsch},
     title = {Die {Eigenwerte} und {Eigenfunktionen} von {Integraltransformationen}},
     journal = {Mathematische Annalen},
     pages = {106--128},
     publisher = {mathdoc},
     volume = {117},
     year = {1940},
     zbl = {0021.40702},
     url = {http://geodesic.mathdoc.fr/item/MAN_1940__117_160044/}
}