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https://update.library.uitm.edu.my./Record/Gaffar%20V.;%20Christiyanto%20W.W.;%20Arissaputra%20R.;%20Abror%20A.;%20Achmad%20N.;%20Hidayat%20E.F.F.;%20Siregar%20Q.A.;%20Shahril%20A.