GABRIEL, Erwin.
 Editorial Board.
<strong>Philippine Engineering Journal</strong>, [S.l.], v. 40, n. 1, june 2019.
ISSN 2718-9287.
Available at: &lt;<a href="https://www.journals.upd.edu.ph/index.php/pej/article/view/6824" target="_new">https://www.journals.upd.edu.ph/index.php/pej/article/view/6824</a>&gt;. Date accessed: 17 sep. 2025.