A note on the representability of quaternary quadratic forms as sums of squares of two linear forms
Hardy, John
Portugaliae mathematica, Tome 29 (1970), p. 161-164 / Harvested from Portugaliae Mathematica
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Publié le : 1970-01-01
EUDML-ID : urn:eudml:doc:115123 
@article{2633,
     author = {Hardy, John},
     title = {A note on the representability of quaternary quadratic forms as sums of squares of two linear forms},
     journal = {Portugaliae mathematica},
     volume = {29},
     year = {1970},
     pages = {161-164},
     zbl = {0218.10036},
     mrnumber = {0323711},
     language = {en},
     url = {http://dml.mathdoc.fr/item/2633}
}

Hardy, John. A note on the representability of quaternary quadratic forms as sums of squares of two linear forms. Portugaliae mathematica, Tome 29 (1970) pp. 161-164. http://gdmltest.u-ga.fr/item/2633/