Atta-ur-Rehman, ., Yasmeen, K., Mohiuddin, S., Bashir, L., & Naz, S. (2016). Assessment of Source of Contamination of Heavy Metals and Estimation of Metals Risk in Smokeless Tobacco Products. Asian Journal of Chemistry, 28(7), 1440–1446. https://doi.org/10.14233/ajchem.2016.19717