Nadia M. G. AL-Sa'idi and  Muhammad Rushdan Md. Sd. and  Adil M. Ahmed,  IFS on the Multi-Fuzzy Fractal Space.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    May 2009, vol. 29(5). 338 - 342
    [viewed 17 January 2020]. Available from: https://publications.waset.org/pdf/10553.