H. Berier and A. . Elhag, “Investigation of Some Trace Elements and Heavy Metals Concentrations in Selected Sudanese Medicinal Plants”, IJSBAR, vol. 49, no. 1, pp. 98–108, Jan. 2020, Accessed: Oct. 12, 2025. [Online]. Available: https://www.gssrr.org/JournalOfBasicAndApplied/article/view/10667