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Ojanguren, M., Parimala, R. & Sridharan, R. Indecomposable quadratic bundles of rank 4n over the real affine plane. Invent Math 71, 643–653 (1983). https://doi.org/10.1007/BF02095998
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DOI: https://doi.org/10.1007/BF02095998