@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/}
}