YAHAYA, I.; MUNDI, A.; MUSTAPHA, I.; ISAH, J.; MOHAMMED, M. Evaluation of Concentration of Copper, Lead, and Zinc in Different Brands of Cigarette Sold in Keffi Main Market of Nasarawa State, Nigeria. Asian Journal of Advanced Research and Reports, v. 4, n. 4, p. 1-7, 6 jun. 2019.