SHAKYA, PAWAN RAJ et al. Studies and Determination of Heavy Metals in Waste Tyres and their Impacts on the Environment. Pakistan Journal of Analytical & Environmental Chemistry, [S.l.], v. 7, n. 2, p. 7, june 2006. ISSN 2221-5255. Available at: <http://pjaec.pk/index.php/pjaec/article/view/52>. Date accessed: 19 sep. 2021.