Abdullah A. AlShaher,  Arabic Character Recognition Using Regression Curves with the Expectation Maximization Algorithm.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2018, vol. 144(12). 1087 - 1091
    [viewed 22 January 2022]. Available from: https://publications.waset.org/pdf/10009888.