Avadhesh Yadav and  Manoj Kumar and  Balram,  Experimental Study and Analysis of Parabolic trough Collector with Various Reflectors.   journal   = {International Journal of Energy and Power Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2013, vol. 84(12). 1659 - 1663
    [viewed 26 February 2020]. Available from: https://publications.waset.org/pdf/9996680.