Mario Mastriani and  Juliana Gambini,  Fast Cosine Transform to Increase Speed-up and Efficiency of Karhunen-Loève Transform for Lossy Image Compression.   journal   = {International Journal of Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2010, vol. 37(1). 199 - 209
    [viewed 19 October 2019]. Available from: https://publications.waset.org/pdf/2982.