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<strong>Science and Technology Indonesia</strong>, [S.l.], v. 2, n. 4, p. 102-104, oct. 2017.
ISSN 2580-4391.
Available at: &lt;<a href="http://sciencetechindonesia.com/index.php/jsti/article/view/51" target="_new">http://sciencetechindonesia.com/index.php/jsti/article/view/51</a>&gt;. Date accessed: 12 july 2020.
doi: <a href="https://doi.org/10.26554/sti.2017.2.4.102-104">https://doi.org/10.26554/sti.2017.2.4.102-104</a>.