@article{MAN_1949__121_160184,
     author = {Karl Lattermann},
     title = {\"Uber die {Nichtexistenz} periodischer {L\"osungen} der kritischen {Kreise.}},
     journal = {Mathematische Annalen},
     pages = {327--339},
     publisher = {mathdoc},
     volume = {121},
     year = {1949},
     zbl = {0038.42901},
     url = {http://geodesic.mathdoc.fr/item/MAN_1949__121_160184/}
}