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@article{PORMA_1967__26_2_115009, author = {Dickman, R.F. jr.}, title = {On openness properties of mappings}, journal = {Portugaliae mathematica}, pages = {115--123}, publisher = {mathdoc}, volume = {26}, number = {2}, year = {1967}, mrnumber = {0248765}, zbl = {0186.56204}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1967__26_2_115009/} }
Dickman, R.F. jr. On openness properties of mappings. Portugaliae mathematica, Tome 26 (1967) no. 2, pp. 115-123. http://geodesic.mathdoc.fr/item/PORMA_1967__26_2_115009/