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2-s2.0-85101061914
http://ejournal.unsub.ac.id/index.php/FTK/article/view/824
http://ejournal.unsub.ac.id/index.php/FTK/article/view/365
http://ejournal.unsub.ac.id/index.php/FTK/article/view/366
http://ejournal.unsub.ac.id/index.php/FTK/article/view/370
http://ejournal.unsub.ac.id/index.php/FTK/article/view/118
http://ejournal.unsub.ac.id/index.php/FTK/article/view/117