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References:
[1] Drake D. A.: Existence of parallelism and projective extensions for strongly n-uniform near affine Hjelmslev planes. Geometriae Dedicata 3, 191-214 (1974). MR 0348608
[2] Machala F.: Über projektive Erweiterung affiner Ebenen mit Homomorphismus. Czech. Math. Journal 29 (104), 116-129 (1979). MR 0518146
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