Ngekpe, B. E., J. Burabari, and C. Ukpaka. “Predictive Models of Compressive Strength Concrete Produced from Recycled Concrete Aggregate”. International Journal For Research In Mechanical & Civil Engineering, vol. 4, no. 4, Apr. 2018, pp. 33-45, doi:10.53555/mce.v4i4.381.