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Both authors are members of GNSAGA of Italian CNR.
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Alzati, A., Ottaviani, G. On the 3 and 4-normality of codimension two subvarieties of ℙn . Arch. Math 55, 610–618 (1990). https://doi.org/10.1007/BF01191698
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DOI: https://doi.org/10.1007/BF01191698