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@article{MZ_1932__35_168340, author = {L. J., Mordell}, title = {On the representation of a binary quadratic form as a sum of squares of linear forms}, journal = {Mathematische Zeitschrift}, pages = {1--15}, publisher = {mathdoc}, volume = {35}, year = {1932}, zbl = {0003.33804}, url = {http://geodesic.mathdoc.fr/item/MZ_1932__35_168340/} }
L. J., Mordell. On the representation of a binary quadratic form as a sum of squares of linear forms. Mathematische Zeitschrift, Tome 35 (1932), pp. 1-15. http://geodesic.mathdoc.fr/item/MZ_1932__35_168340/