Serge B. Provost and  Min Jiang,  Orthogonal Polynomial Density Estimates: Alternative Representation and Degree Selection.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    July 2011, vol. 55(7). 1089 - 1096
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/1168.