ABUZO, Anabel A.; 						SIGUA, Ricardo G.; 						VERGEL, Karl N..
 Development of Drive Cycle and Emission Concentration Models for In-Use Tricycles in Metro Manila.
<strong>Philippine Engineering Journal</strong>, [S.l.], v. 25, n. 2, aug. 2011.
ISSN 2718-9287.
Available at: &lt;<a href="https://journals.upd.edu.ph/index.php/pej/article/view/2341" target="_new">https://journals.upd.edu.ph/index.php/pej/article/view/2341</a>&gt;. Date accessed: 08 sep. 2025.