@article{1077475037, author = {Ward, Morgan}, title = {Euler's problem on sums of three fourth powers}, journal = {Duke Math. J.}, volume = {15}, number = {1}, year = {1948}, pages = { 827-837}, language = {en}, url = {http://dml.mathdoc.fr/item/1077475037} }
Ward, Morgan. Euler’s problem on sums of three fourth powers. Duke Math. J., Tome 15 (1948) no. 1, pp. 827-837. http://gdmltest.u-ga.fr/item/1077475037/