@article{MZ_1937__42_168709,
     author = {H., Raff},
     title = {Bemerkungen zu zwei {S\"atzen} von {Hans} {Hahn} \"uber lineare {Integraltransformationen}},
     journal = {Mathematische Zeitschrift},
     pages = {151--160},
     publisher = {mathdoc},
     volume = {42},
     year = {1937},
     zbl = {0015.21302},
     url = {http://geodesic.mathdoc.fr/item/MZ_1937__42_168709/}
}