On Author’s Request, T. A. H. B. W. “EVALUATION OF THE PRESENCE OF THE HEAVY METAL NICKEL IN SAMPLES OF TOBACCO SNUFF (NICOTIANA TABACUM) IN NIGERIA”. International Journal of Pharmacy and Pharmaceutical Sciences, vol. 7, no. 5, May 2015, pp. 233-6, https://journals.innovareacademics.in/index.php/ijpps/article/view/5302.