WASET
    Mina Alibeigi and  Sattar Hashemi and  Ali Hamzeh,  Unsupervised Feature Selection Using Feature Density Functions.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2009, vol. 27(3). 847 - 852
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/11347.