OSTREA, Enrique; 						ELICAÑO, V..
 Outlook of Gold Refining in the Philippine Islands.
<strong>Philippine Engineering Journal</strong>, [S.l.], v. 31, n. 2, aug. 2021.
ISSN 2718-9287.
Available at: &lt;<a href="https://www.journals.upd.edu.ph/index.php/pej/article/view/7955" target="_new">https://www.journals.upd.edu.ph/index.php/pej/article/view/7955</a>&gt;. Date accessed: 01 sep. 2025.