Hong Pan and  Yaping Zhu and  Liang Zheng Xia,  Hierarchical PSO-Adaboost Based Classifiers for Fast and Robust Face Detection.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2011, vol. 59(11). 1322 - 1327
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/101.