Bounessah, M., and S.M. Al-Shayeb. “Assessment of Plant Leaves As a Biomonitor for Atmospheric Pollution by Lead in an Arid Environment : A Comparative Study”. Asian Journal of Chemistry, vol. 17, no. 2, Jan. 2016, pp. 1298-00, https://asianpubs.org/index.php/ajchem/article/view/14250.