Geodesic
Filtrations of 2-elementary forms and involutions of integral symmetric and skew-symmetric bilinear forms
Izvestiya. Mathematics , Tome 27 (1986) no. 1, pp. 159-182

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In connection with the study of involutions of integral symmetric bilinear forms, for a finite quadratic (symmetric bilinear) 2-form there is defined on the annihilator of 2 a filtration of finite quadratic (symmetric bilinear) forms. The image of the group of automorphisms of the 2-form in the group of automorphisms of the filtration is determined, and an analogue of Witt's theorem is proved for these groups. Bibliography: 15 titles. 
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     author = {V. V. Nikulin},
     title = {Filtrations of 2-elementary forms and involutions of integral symmetric and skew-symmetric bilinear forms},
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V. V. Nikulin. Filtrations of 2-elementary forms and involutions of integral symmetric and skew-symmetric bilinear forms. Izvestiya. Mathematics , Tome 27 (1986) no. 1, pp. 159-182. http://geodesic.mathdoc.fr/item/IM2_1986_27_1_a8/