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Research supported in part by NSF Grant GP 9584.
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Hering, C.H., Kantor, W.M. On the Lenz-Barlotti classification of projective planes. Arch. Math 22, 221–224 (1971). https://doi.org/10.1007/BF01222566
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DOI: https://doi.org/10.1007/BF01222566