Otitoloju, A. A., and K. Don-Pedro. “Influence of Joint Application of Heavy Metals on Level of Each Metal Accumulated in the Periwinkle Tympanotonus Fuscatus (Gastropoda: Potamididae)”. Revista De Biología Tropical, vol. 54, no. 3, Sept. 2006, pp. 803–814, doi:10.15517/rbt.v54i3.12791.