Otitoloju, A. A., & Don-Pedro, K. (2006). Influence of joint application of heavy metals on level of each metal accumulated in the periwinkle Tympanotonus fuscatus (Gastropoda: Potamididae). Revista De Biología Tropical, 54(3), 803–814. https://doi.org/10.15517/rbt.v54i3.12791