Al-Shayeb, S.M. “Metals Content of Roadside Soils in Riyadh (Saudi Arabia), With Particular Reference to Traffic Density ”. Asian Journal of Chemistry 15, no. 3 (March 30, 2010): 1229–1245. Accessed December 16, 2025. https://asianpubs.org/index.php/ajchem/article/view/21797.