M. B. El_Mashade and  I. I. Mahamoud and  M. S. El_Tokhy,  Performance Analysis of Quantum Cascaded Lasers.   journal   = {International Journal of Nuclear and Quantum Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2008, vol. 17(5). 1763 - 1765
    [viewed 15 October 2019]. Available from: https://publications.waset.org/pdf/8921.