WASET
    Atilla Akpinar and  Basri Celik,  On Cross-Ratio in some Moufang-Klingenberg Planes.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    August 2010, vol. 44(8). 1202 - 1206
    [viewed 19 September 2024]. Available from: https://publications.waset.org/pdf/7820.