O.P, A., P., A. and A., A.A. 2010. Phytoaccumulation of zinc and iron by Jatropha curcas grown in used lubrication oil-contaminated soil. Malaysian Journal of Science. 29, 3 (Dec. 2010), 207–213. DOI:https://doi.org/10.22452/mjs.vol29no3.3.