Singh, J., V. K. Singh, M. Anand, P. Kumar, and M. Siddiqui. “Placental Lead and Its Interaction With Some Essential Metals Among Women from Lucknow, India”. Asian Journal of Medical Sciences, vol. 1, no. 2, Jan. 2011, pp. 32-36, doi:10.3126/ajms.v1i2.3199.