Avadhesh Yadav and  Anunaya Saraswat,  An Experimental Study on Evacuated Tube Solar Collector for Steam Generation in India.   journal   = {International Journal of Energy and Power Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2016, vol. 113(5). 623 - 627
    [viewed 24 February 2020]. Available from: https://publications.waset.org/pdf/10004361.