WASET
    Lee P. Leon and  Raymond Charles,  Aggregate Angularity on the Permanent Deformation Zones of Hot Mix Asphalt.   journal   = {International Journal of Civil and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2015, vol. 103(7). 807 - 810
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/10001627.