Deligannu, P., Z. Hashim, S. M. Elias, and A. Z. Aris. “Total Mercury (THg), Lead (Pb), Cadmium (Cd) and Arsenic (As) in Hair Samples: Method Validation and Quantification Among Women at Reproductive Age in Selangor”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 24, no. 4, Oct. 2015, pp. 332-47, https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/4749.