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On rank 4 quadratic spaces with given Arf and Witt invariants

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Knus, M.A., Parimala, R. & Sridharan, R. On rank 4 quadratic spaces with given Arf and Witt invariants. Math. Ann. 274, 181–198 (1986). https://doi.org/10.1007/BF01457069

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