@article{1183417712,
author = {Westlund, Jacob},
title = {On the congruence $x^{\phi \left( P \right)} \equiv 1,\,\bmod.\,P^n$},
journal = {Bull. Amer. Math. Soc.},
volume = {10},
number = {3},
year = {1903},
pages = { 78-80},
language = {en},
url = {http://dml.mathdoc.fr/item/1183417712}
}
Westlund, Jacob. On the congruence $x^{\phi \left( P \right)} \equiv 1,\,\bmod.\,P^n$. Bull. Amer. Math. Soc., Tome 10 (1903) no. 3, pp. 78-80. http://gdmltest.u-ga.fr/item/1183417712/