S. Nazhan and  Hassan K. Al-Musawi and  Khalid A. Humood,  Experimental Demonstration of an Ultra-Low Power Vertical-Cavity Surface-Emitting Laser for Optical Power Generation.   journal   = {International Journal of Electronics and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2021, vol. 169(1). 19 - 23
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/10011753.