Chibuzor, S. N., E. lfeyinwa Okoyeh, and B. C. E. Egboka. “Geotechnical Characteristics of Regolith Derived from Nanka Formation, Southeast Nigeria”. European Journal of Engineering and Technology Research, Vol. 5, no. 12, Dec. 2020, pp. 67-75, doi:10.24018/ejers.2020.5.12.2230.