1. J. Emsley, Nature’s building blocks, new edition, Oxford Univ. Press, Oxford (2011).
2. L. F. Kozin and S. C. Hansen, Mercury handbook: chemistry, applications and environmental impact, R. soc. chem., UK (2013).
3. H. Ali and E. Khan, Toxicol. Environ. Chem., 100, 6 (2018).
4. A. Tolcin, U.S. Geological Survey, Mineral Commodity Summaries 2020, Independently Published (2020).
5. Statista Research Department. World production of lead from 2006 to 2018 2019, Dec 1