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References

  1. S. Ditor, A new kind of free extension for projective planes. Canad. Math. Bull.5 (1962) 167–170.

    MATH  MathSciNet  Google Scholar 

  2. E. Glock, Polaritäten von endlich erzeugten freien Ebenen. Math. Z.110 (1969) 257–296.

    Article  MATH  MathSciNet  Google Scholar 

  3. A. Schleiermacher andK. Strambach, Über die Gruppe der Projektivitäten in nichtgeschlossenen Ebenen. Arch. Math.18 (1967) 299–307.

    Article  MATH  MathSciNet  Google Scholar 

  4. L. C. Siebenmann, A characterization of free projective planes. Pacific J. Math.15 (1965) 293–298.

    MATH  MathSciNet  Google Scholar 

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ToEmanuel Sperner on his 65th birthday

This work has been partially supported by National Research Council of Canada grant no. A 7251.

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Ellers, E., Row, D. Hyperfree extensions. Abh.Math.Semin.Univ.Hambg. 37, 46–49 (1972). https://doi.org/10.1007/BF02993898

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  • DOI: https://doi.org/10.1007/BF02993898

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