1. Nickel(II) removal from aqueous solutions by adsorption on flyash;Vishwakarma;Pertanika,1989
2. Heavy metal pollution of river Ganga in Mirzapur, India;Sharma;Intern. J. Environ. Studies,1992
3. The lesser metals;Beliles,1979
4. Encyclopedia of Environmental Sciences,1980
5. Removing heavy metals from wastewater;Dean;Environ. Sci. Technol.,1972