On Cross-Ratio in some Moufang-Klingenberg Planes Year: 2010 Volume: 4 Issue: 8 1149 - 1153 Pages Authors: Atilla Akpinar Basri Celik Abstract: In this paper we are interested in Moufang-Klingenberg planesM(A) defined over a local alternative ring A of dual numbers. We show that a collineation of M(A) preserve cross-ratio. Also, we obtain some results about harmonic points. Keywords: Moufang-Klingenberg planes local alternative ring projective collineation cross-ratio harmonic points.