Parekhan M. Aljaff and  Banaz O. Rasheed,  Design Optimization for Efficient Erbium-Doped Fiber Amplifiers.   journal   = {International Journal of Physical and Mathematical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    October 2008, vol. 22(10). 704 - 707
    [viewed 19 March 2024]. Available from: https://publications.waset.org/pdf/15018.