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\bibitem{Eltayeb+VanGrieken1990} {\textquotedblleft}\textit{Iron, copper, zinc and lead in hair from Sudanese populations of different age groups}{\textquotedblright}. Eltayeb MAH, Van Grieken RE, The science of the total environment \textbf{95}, 157 (1990).   http://doi.org/10.1016/0048-9697(90)90061-X

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