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This paper was written with the financial assistance of National Science Foundation grant MCS-8301351.
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Drake, D.A. A covering theorem for Baer subplanes in a cyclic projective plane. Geom Dedicata 18, 181–190 (1985). https://doi.org/10.1007/BF00151397
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DOI: https://doi.org/10.1007/BF00151397