On sums of squares
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Proceedings of the international conference on number theory, Tome 132 (1973), pp. 114-117.

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     author = {J. W. S. Cassels},
     title = {On sums of squares},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
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     volume = {132},
     year = {1973},
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     url = {http://geodesic.mathdoc.fr/item/TM_1973_132_a14/}
}
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J. W. S. Cassels. On sums of squares. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Proceedings of the international conference on number theory, Tome 132 (1973), pp. 114-117. http://geodesic.mathdoc.fr/item/TM_1973_132_a14/