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References:
[1] G. Pickert: Projektive Ebenen. Berlin-Göttingen-Heidelberg 1955. MR 0073211 | Zbl 0066.38707
[2] V. Devidé: Plane pre-projective geometries. Glasnik Matem.-Fiz. Astron. (Zagreb), Ser. II, 20 (1965), 251-260. MR 0212663
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