R. Abd Rashid, N. A. Muda, M. Saaid, M. I. Abdul Halim, and K. Mohamed, “Determination of Cd, Cu, Ni and Pb in Selected rice Grain Available in Malaysia”, IJET, vol. 7, no. 4.14, pp. 232–236, Dec. 2019, doi: 10.14419/ijet.v7i4.14.27569.