@article{GDZPPN002486601, title = {Sums of Four Cubes.}, journal = {Monatshefte f\"ur Mathematik}, volume = {108}, year = {1989}, pages = {179-188}, zbl = {0679.10038}, url = {http://dml.mathdoc.fr/item/GDZPPN002486601} }
Brüdern, Jörg. Sums of Four Cubes.. Monatshefte für Mathematik, Tome 108 (1989) pp. 179-188. http://gdmltest.u-ga.fr/item/GDZPPN002486601/