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@article{CMH_1955__29_139103, author = {D.G. Bourgin}, title = {On some separation and mapping theorems.}, journal = {Commentarii mathematici Helvetici}, pages = {199--214}, publisher = {mathdoc}, volume = {29}, year = {1955}, zbl = {0065.16604}, url = {http://geodesic.mathdoc.fr/item/CMH_1955__29_139103/} }
D.G. Bourgin. On some separation and mapping theorems.. Commentarii mathematici Helvetici, Tome 29 (1955), pp. 199-214. http://geodesic.mathdoc.fr/item/CMH_1955__29_139103/