D. Akachukwu, U. Mbakwe, and I. A. Okoro, “Assessment of Heavy Metal Content of Njere River in Umuakam, Okaiuga Nkwoegwu, Umuahia North L.G.A”, Arch. Curr. Res. Int., vol. 8, no. 1, pp. 1–5, Jun. 2017.