Otitoloju, A.A. and 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 (Sep. 2006), 803–814. DOI:https://doi.org/10.15517/rbt.v54i3.12791.