E. . Onweremadu, B. Aririguzo, N. Okoli, and I. . Afangide, “Temporal Variability of Soil Reaction Among Surface and Near-Surface Horizons of Soils of Dissimilar Lithology in a Humid Tropical Environment”, Int. J. Environ., vol. 10, no. 1, pp. 99–111, Jul. 2021.