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Von Schwabhäuser, W. Modellvollständigkeit der Mittelpunktsgeometrie und der Theorie der Vektorgruppen. Abh.Math.Semin.Univ.Hambg. 48, 213–224 (1979). https://doi.org/10.1007/BF02941301
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DOI: https://doi.org/10.1007/BF02941301