Zebari , R., A. Abdulazeez, D. Zeebaree, D. Zebari, and J. Saeed. “A Comprehensive Review of Dimensionality Reduction Techniques for Feature Selection and Feature Extraction”. Journal of Applied Science and Technology Trends, vol. 1, no. 2, May 2020, pp. 56 -70, doi:10.38094/jastt1224.