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@article{MM2_1969__1_153971, author = {Heinz-Dieter Niessen}, title = {Graphens\"atze f\"ur topologische {R\"aume.}}, journal = {Manuscripta mathematica}, pages = {111--124}, publisher = {mathdoc}, volume = {1}, year = {1969}, zbl = {0167.51204}, url = {http://geodesic.mathdoc.fr/item/MM2_1969__1_153971/} }
Heinz-Dieter Niessen. Graphensätze für topologische Räume.. Manuscripta mathematica, Tome 1 (1969), pp. 111-124. http://geodesic.mathdoc.fr/item/MM2_1969__1_153971/