R. K. Z. Sahbudin and  M. K. Abdullah and  M. Mokhtar and  S. B. A. Anas and  S. Hitam,  Performance of Subcarrier- OCDMA System with Complementary Subtraction Detection Technique.   journal   = {International Journal of Electronics and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2011, vol. 51(3). 459 - 464
    [viewed 01 October 2022]. Available from: https://publications.waset.org/pdf/3521.