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			SIMPEN, Nengah et al.
 Solid Catalyst in Esterification and Transesterification Reactions for  Biodiesel Production: A Review.
<strong>International Journal of Engineering and Emerging Technology</strong>, [S.l.], v. 5, n. 2, p. 168-174, dec. 2020.
ISSN 2579-5988.
Available at: &lt;<a href="https://ojs.unud.ac.id/index.php/ijeet/article/view/67713" target="_new">https://ojs.unud.ac.id/index.php/ijeet/article/view/67713</a>&gt;. Date accessed: 02 sep. 2026.
doi: <a href="https://doi.org/10.24843/IJEET.2020.v05.i02.p29">https://doi.org/10.24843/IJEET.2020.v05.i02.p29</a>.