@article{1103034365, author = {Graham, R. L.}, title = {On finite sums of reciprocals of distinct $n$th powers.}, journal = {Pacific J. Math.}, volume = {14}, number = {4}, year = {1964}, pages = { 85-92}, language = {en}, url = {http://dml.mathdoc.fr/item/1103034365} }
Graham, R. L. On finite sums of reciprocals of distinct $n$th powers.. Pacific J. Math., Tome 14 (1964) no. 4, pp. 85-92. http://gdmltest.u-ga.fr/item/1103034365/