Geodesic
On positive-definite biquadratic forms that cannot be represented as the sum of squares of bilinear forms
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 2 (1995), pp. 29-33 Cet article a éte moissonné depuis la source Math-Net.Ru

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@article{VMUMM_1995_2_a5,
     author = {D. V. Matyukhin},
     title = {On positive-definite biquadratic forms that cannot be represented as the sum of squares of bilinear forms},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {29--33},
     year = {1995},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1995_2_a5/}
}
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D. V. Matyukhin. On positive-definite biquadratic forms that cannot be represented as the sum of squares of bilinear forms. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 2 (1995), pp. 29-33. http://geodesic.mathdoc.fr/item/VMUMM_1995_2_a5/