PONCE, Y. D. M.; 						LAZARTE, J. R. S.; 						RAMOS, H. J..
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<strong>Science Diliman: A Journal of Pure and Applied Sciences</strong>, [S.l.], v. 16, n. 2, july 2007.
ISSN 2012-0818.
Available at: &lt;<a href="https://journals.upd.edu.ph/index.php/sciencediliman/article/view/106" target="_new">https://journals.upd.edu.ph/index.php/sciencediliman/article/view/106</a>&gt;. Date accessed: 05 aug. 2025.