WASET
    M. Amir Abas and  M. Dahlui,  Investigating Ultra Violet (UV) Strength against Different Level of Altitude using New Environmental Data Management System.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2011, vol. 59(11). 654 - 658
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/14339.