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@article{MZ_1986__193_173786, author = {R. Baeza and D. Leep and M. O'Ryan}, title = {Sums of {Squares} of {Linear} {Forms.}}, journal = {Mathematische Zeitschrift}, pages = {297--306}, publisher = {mathdoc}, volume = {193}, year = {1986}, zbl = {0598.10032}, url = {http://geodesic.mathdoc.fr/item/MZ_1986__193_173786/} }
R. Baeza; D. Leep; M. O'Ryan. Sums of Squares of Linear Forms.. Mathematische Zeitschrift, Tome 193 (1986), pp. 297-306. http://geodesic.mathdoc.fr/item/MZ_1986__193_173786/