@article{1183419950, author = {Carmichael, R. D.}, title = {Even multiply perfect numbers of five different prime factors}, journal = {Bull. Amer. Math. Soc.}, volume = {15}, number = {3}, year = {1908}, pages = { 7-8}, language = {en}, url = {http://dml.mathdoc.fr/item/1183419950} }
Carmichael, R. D. Even multiply perfect numbers of five different prime factors. Bull. Amer. Math. Soc., Tome 15 (1908) no. 3, pp. 7-8. http://gdmltest.u-ga.fr/item/1183419950/