Mingyu Zhong and  Yi Xie,  The Application of Hadamard Matrixes in the SNR Enhancement of Optical Time-Domain Reflectometry(OTDR).   journal   = {International Journal of Electronics and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2008, vol. 18(6). 1233 - 1235
    [viewed 27 April 2024]. Available from: https://publications.waset.org/pdf/651.