De Vera, J., 		Quirit, L., & 		Rodriguez, I.
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 Determination of Cr, Cd, Sn, and Pb in Selected Herbal Products Available in Philippine Markets.
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Retrieved from <a href="https://www.journals.upd.edu.ph/index.php/sciencediliman/article/view/5829" target="_new">https://www.journals.upd.edu.ph/index.php/sciencediliman/article/view/5829</a>