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@article{MAN_1919__80_158811, author = {L.E.J. Brouwer}, title = {\"Uber die periodischen {Transformationen} der {Kugel.} {Von} {L.E.J.} {Brouwer} in {Amsterdam}}, journal = {Mathematische Annalen}, pages = {39--41}, publisher = {mathdoc}, volume = {80}, year = {1919}, language = {de}, url = {http://geodesic.mathdoc.fr/item/MAN_1919__80_158811/} }
L.E.J. Brouwer. Über die periodischen Transformationen der Kugel. Von L.E.J. Brouwer in Amsterdam. Mathematische Annalen, Tome 80 (1919), pp. 39-41. http://geodesic.mathdoc.fr/item/MAN_1919__80_158811/