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Moshchevitin, N. Eine Bemerkung über positiv definite quadratische Formen und rationale Punkte. Math. Z. 285, 1381–1388 (2017). https://doi.org/10.1007/s00209-016-1752-4
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DOI: https://doi.org/10.1007/s00209-016-1752-4