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The author would like to thank the mathematics department at Università degli Studi di Trento, for support while part of this work was done.
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Morandi, P.J. A Springer theorem for higher degree forms. Math. Z. 256, 221–228 (2007). https://doi.org/10.1007/s00209-006-0070-7
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DOI: https://doi.org/10.1007/s00209-006-0070-7