Omaima N. Ahmad AL-Allaf,  Particle Swarm Optimization Algorithm vs. Genetic Algorithm for Image Watermarking Based Discrete Wavelet Transform.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    September 2017, vol. 129(9). 1106 - 1112
    [viewed 29 February 2020]. Available from: https://publications.waset.org/pdf/10008075.