@article{MAN_1940__117_160065,
     author = {Fr. Wecken},
     title = {Fixpunktklassen. {I.}},
     journal = {Mathematische Annalen},
     pages = {659--671},
     publisher = {mathdoc},
     volume = {117},
     year = {1940},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MAN_1940__117_160065/}
}