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@article{MAN_1904__58_158121, author = {A. Sch\"onflies}, title = {Beitr\"age zur {Theorie} der {Punktmengen.} {I.}}, journal = {Mathematische Annalen}, pages = {195--234}, publisher = {mathdoc}, volume = {58}, year = {1904}, zbl = {34.0074.03}, url = {http://geodesic.mathdoc.fr/item/MAN_1904__58_158121/} }
A. Schönflies. Beiträge zur Theorie der Punktmengen. I.. Mathematische Annalen, Tome 58 (1904), pp. 195-234. http://geodesic.mathdoc.fr/item/MAN_1904__58_158121/