WASET
    Hashibah Hamid,  A New Approach for Classifying Large Number of Mixed Variables.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    October 2010, vol. 46(10). 1355 - 1360
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/14621.