N. J. . Nepo, S. . Muthiah, R. . Eric, H. . Eliezel, M. V. . Alphonsine, and R. . Hamoud, “Study of Heavy Metals Variability and their Effect on Plant Growth in Kanzenze River of Upper Akagera Catchment, Rwanda”, ijhr, vol. 5, no. 1, pp. 32–45, Oct. 2020.