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"TPDSci Ind Ext". tpdsci.com. Diarsipkan dari versi asli tanggal 2014-01-15. Diakses tanggal 2014-02-28.
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"TPDSci Ind Ext". tpdsci.com. Diarsipkan dari versi asli tanggal 2014-01-15. Diakses tanggal 2014-02-28.