Geodesic
A~variant of a~theorem by Springer
Algebra i analiz, Tome 19 (2007) no. 6, pp. 117-125.

Voir la notice de l'article provenant de la source Math-Net.Ru

The theorem in question gives a sufficient condition for a quadratic space over a local ring $R$ to contain a hyperbolic plane over $R$.
Keywords: Quadratic forms, Springer's theorem, local domain. 
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I. Panin; U. Rehmann. A~variant of a~theorem by Springer. Algebra i analiz, Tome 19 (2007) no. 6, pp. 117-125. http://geodesic.mathdoc.fr/item/AA_2007_19_6_a4/

[1] Lam T. Y., The algebraic theory of quadratic forms, Math. Lecture Note Ser., W. A. Benjamin, Inc., Reading, MA, 1973 | MR | Zbl

[2] Panin I., Rationally isotropic quadratic spaces are locally isotropic, http://www.math.uiuc.edu/K-theory/0671/