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Dedicated to Helmut Karzel on the occasion of his 70th birthday
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Benz, W., Ghalieh, K. Groupoids associated with the ternary ring of a projective plane. J Geom 61, 17–31 (1998). https://doi.org/10.1007/BF01237490
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DOI: https://doi.org/10.1007/BF01237490