Geodesic
Geometry of normed bilinear maps and the 16-square problem.
Mathematische Annalen, Tome 284 (1989) no. 4, pp. 437-448.

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Mots-clés : geometry of normed bilinear maps, 16-square problem, real algebraic variety, sums of squares formulas 
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     author = {K.Y. Lam and P.Y.H. Yiu},
     title = {Geometry of normed bilinear maps and the 16-square problem.},
     journal = {Mathematische Annalen},
     pages = {437--448},
     publisher = {mathdoc},
     volume = {284},
     number = {4},
     year = {1989},
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K.Y. Lam; P.Y.H. Yiu. Geometry of normed bilinear maps and the 16-square problem.. Mathematische Annalen, Tome 284 (1989) no. 4, pp. 437-448. http://geodesic.mathdoc.fr/item/MAN_1989__284_4_164563/