@article{1172000966,
author = {Ward, Morgan},
title = {The mappings of the positive integers into themselves which preserve division},
journal = {Pacific J. Math.},
volume = {5},
number = {4},
year = {1955},
pages = { 1013-1023},
language = {en},
url = {http://dml.mathdoc.fr/item/1172000966}
}
Ward, Morgan. The mappings of the positive integers into themselves which preserve division. Pacific J. Math., Tome 5 (1955) no. 4, pp. 1013-1023. http://gdmltest.u-ga.fr/item/1172000966/