@article{MAN_1949__121_160168,
     author = {Benno Hesselbach},
     title = {Ein {Vertauschungsatz} f\"ur elliptische {Integrale} erster {Gattung.}},
     journal = {Mathematische Annalen},
     pages = {33--40},
     publisher = {mathdoc},
     volume = {121},
     year = {1949},
     zbl = {0032.34402},
     url = {http://geodesic.mathdoc.fr/item/MAN_1949__121_160168/}
}