Kumboon, Amnouy. “Grey Relational Analysis for Optimal Condition of Biodiesel Production Process from Fish Entrails”. Srinakharinwirot University Engineering Journal 14, no. 1 (September 5, 2019): 88–98. accessed December 6, 2025. https://ph02.tci-thaijo.org/index.php/sej/article/view/184914.