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We consider a generalization of the representation of the so-called co-Minkowski plane (due to H. and R. Struve) to an abelian group (V; +) and a commutative subgroup G of Aut(V; +). If P = G × V satisÿes suitable conditions then an invariant reeection structure (in the sense of Karzel (Discrete Math. 208=209 (1999) 387– 409)) can be introduced in P which… (More)

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