WASET
    E. T. L. Cöuras Ford and  V. A. C.Vale and  J. U. L Mendes,  Viability Analysis of the Use of Solar Energy for Water Heating in Brazil .   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2015, vol. 102(6). 777 - 780
    [viewed 20 April 2024]. Available from: https://publications.waset.org/pdf/10003627.