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Research partially supported by M.P.I. (Research project “Strutture geometriche combinatorie e loro applicazioni”).
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Abatangelo, V. On Buekenhout-Metz unitals in PG(2,q 2),q even. Arch. Math 59, 197–203 (1992). https://doi.org/10.1007/BF01190683
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DOI: https://doi.org/10.1007/BF01190683