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Most of the work has been carried out during a stay at the Institute of Mathematics, Justus Liebig-Universität, Giessen, and the author wishes to express his gratitude towards the staff-members of this institute.
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Munkholm, H.J. On the classification of incidence theorems in plane projective geometry. Math Z 90, 215–230 (1965). https://doi.org/10.1007/BF01119205
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DOI: https://doi.org/10.1007/BF01119205