@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/