Ali Awde and  Yacine Bellik and  Chakib Tadj,  Complexity of Mathematical Expressions in Adaptive Multimodal Multimedia System Ensuring Access to Mathematics for Visually Impaired Users.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    March 2008, vol. 15(3). 187 - 199
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/11248.