WASET
    G. M. Ayininuola and  A. O. Sogunro,  Bone Ash Impact on Soil Shear Strength.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2013, vol. 83(11). 793 - 797
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/9997075.