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@article{PORMA_1981__40_3_115457, author = {Hardy, J.T.}, title = {Sums of three squares in certain {Cayley} rings}, journal = {Portugaliae mathematica}, pages = {313--323}, publisher = {mathdoc}, volume = {40}, number = {3}, year = {1981}, mrnumber = {0819897}, zbl = {0576.10016}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1981__40_3_115457/} }
Hardy, J.T. Sums of three squares in certain Cayley rings. Portugaliae mathematica, Tome 40 (1981) no. 3, pp. 313-323. http://geodesic.mathdoc.fr/item/PORMA_1981__40_3_115457/