Geodesic
A computation of the Witt index for rational quadratic forms.
Aequationes mathematicae, Tome 38 (1989) no. 1, pp. 86-98.

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Mots-clés : explicit computation of invariants, rational quadratic forms, modified Hasse invariant, Witt index, Witt ring of p-adics, Witt ring of rationals 
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     author = {Stephen Beale and D.K. Harrison},
     title = {A computation of the {Witt} index for rational quadratic forms.},
     journal = {Aequationes mathematicae},
     pages = {86--98},
     publisher = {mathdoc},
     volume = {38},
     number = {1},
     year = {1989},
     zbl = {0683.10020},
     url = {http://geodesic.mathdoc.fr/item/AM2_1989__38_1_137318/}
}
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Stephen Beale; D.K. Harrison. A computation of the Witt index for rational quadratic forms.. Aequationes mathematicae, Tome 38 (1989) no. 1, pp. 86-98. http://geodesic.mathdoc.fr/item/AM2_1989__38_1_137318/