1. Olutona, G.O., Ajaelu, J.C., and Dawodu, M.O., Rep. Opinion, 2012, vol. 4, no. 10, pp. 4–13.
2. Nkono, N.A, Asubiojo, O.L, Ogunsua, O.A, and Oluwole, A.F., Intern. J. Environ. Studies, 1999, vol. 56, no. 2, pp. 215–230. DOI: 10.1080/00207239908711201.
3. Buffle, J., Trends in Analytical Chemistry, 1981, vol. 1, no. 4, pp. 90–95. DOI: 10.1016/0165-9936(81)80014-3.
4. Linnik, P.N. and Nabivanets, B.I., Formy migratsii metallov v presnykh poverkhnostnykh vodakh (Forms of Metals Migration in Fresh Surface Waters), Leningrad Gidrometeoizdat, 1986.
5. Linnik, P.N., Hydrobiol. J., 2000, vol. 36, no. 3, pp. 31–54. DOI: 10.1615/HydrobJv36i3.20.