Sajad Farokhi and  Siti Mariyam Shamsuddin and  Jan Flusser and  Usman Ullah Sheikh,  Assessment of Time-Lapse in Visible and Thermal Face Recognition.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2012, vol. 62(2). 214 - 219
    [viewed 11 December 2019]. Available from: https://publications.waset.org/pdf/8549.