WASET
    Seong-Ho Song and  Ki-Seob Kim and  Seon-Woo Lee and  Seop-Hyeong Park,  Design of EDFA Gain Controller based on Disturbance Observer Technique.   journal   = {International Journal of Electronics and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2012, vol. 62(2). 224 - 226
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/4593.