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Additional information
Translated from Algebra i Logika, Vol. 22, No. 1, pp. 61–78, January–February, 1983.
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Nikitin, A.A. On freely generated projective planes. Algebra and Logic 22, 45–57 (1983). https://doi.org/10.1007/BF01979649
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DOI: https://doi.org/10.1007/BF01979649