Refaat M Mohamed and  Ayman El-Baz and  Aly A. Farag,  Probability Density Estimation Using Advanced Support Vector Machines and the Expectation Maximization Algorithm.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2007, vol. 2(2). 441 - 444
    [viewed 02 April 2020]. Available from: https://publications.waset.org/pdf/12134.