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Partially supported by Ministero Pubblica Istruzione of the Italian Government.
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Frigerio, E., Turrini, C. On order-two line congruences in ℙn . Arch. Math 55, 412–416 (1990). https://doi.org/10.1007/BF01198483
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DOI: https://doi.org/10.1007/BF01198483