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@article{MOMA_1989__107_3_178420, author = {J\"org Br\"udern}, title = {Sums of {Four} {Cubes.}}, journal = {Monatshefte f\"ur Mathematik}, pages = {179--188}, publisher = {mathdoc}, volume = {107}, number = {3}, year = {1989}, zbl = {0679.10038}, url = {http://geodesic.mathdoc.fr/item/MOMA_1989__107_3_178420/} }
Jörg Brüdern. Sums of Four Cubes.. Monatshefte für Mathematik, Tome 107 (1989) no. 3, pp. 179-188. http://geodesic.mathdoc.fr/item/MOMA_1989__107_3_178420/