@article{1102992105,
author = {Warren, Leroy J. and Bray, Henry G.},
title = {On the square-freeness of Fermat and Mersenne numbers.},
journal = {Pacific J. Math.},
volume = {23},
number = {3},
year = {1967},
pages = { 563-564},
language = {en},
url = {http://dml.mathdoc.fr/item/1102992105}
}
Warren, Leroy J.; Bray, Henry G. On the square-freeness of Fermat and Mersenne numbers.. Pacific J. Math., Tome 23 (1967) no. 3, pp. 563-564. http://gdmltest.u-ga.fr/item/1102992105/