@article{1077466815, author = {Whyburn, G. T.}, title = {Mappings on inverse sets}, journal = {Duke Math. J.}, volume = {23}, number = {1}, year = {1956}, pages = { 237-240}, language = {en}, url = {http://dml.mathdoc.fr/item/1077466815} }
Whyburn, G. T. Mappings on inverse sets. Duke Math. J., Tome 23 (1956) no. 1, pp. 237-240. http://gdmltest.u-ga.fr/item/1077466815/