Anne C. Okwedadi and  Samson Ng’ambi and  Ian Jefferson,  Laboratory Testing Regime for Quantifying Soil Collapsibility.   journal   = {International Journal of Geological and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2014, vol. 96(12). 849 - 854
    [viewed 07 May 2024]. Available from: https://publications.waset.org/pdf/9999943.