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This research was accomplished with the financial support of the Russian Foundation for Fundamental Research, Grant No. 93-011-225.
Translated from Matematicheskie Zametki, Vol. 55, No. 5, pp. 142–153, May, 1994.
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Shevchenko, S.N. Description of the algebra of infinitesimal automorphisms of quadrics of codimension two and their classification. Math Notes 55, 534–542 (1994). https://doi.org/10.1007/BF02110382
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DOI: https://doi.org/10.1007/BF02110382