WASET
    Negar Banan and  Mohd Talib Latif,  An Investigation into Ozone Concentration at Urban and Rural Monitoring Stations in Malaysia.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2011, vol. 53(5). 305 - 309
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/13772.