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Dedicated to Professor Johannes Böhm on the occasion of his 70th birthday
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Meixner, T. A note on three rank four geometries for PΩ6 −(3). J Geom 54, 84–90 (1995). https://doi.org/10.1007/BF01222856
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DOI: https://doi.org/10.1007/BF01222856