Cruz, I.
(2021).
 1. Producer Gas from Indigenous Solid Fuels  2. Conversion of Oil-Fired Boilers to Utilize Solid Fuels.
<em>Philippine Engineering Journal, 31</em>(1).
Retrieved from <a href="https://journals.upd.edu.ph/index.php/pej/article/view/7930" target="_new">https://journals.upd.edu.ph/index.php/pej/article/view/7930</a>