Lerkmahalikhit , Y. ., and S. . Sasananan. “Enhancement of Biogas Production Potential of Water Hyacinth (Eichhornia Speciosa Kunth) Using Integrated Solar Radiation and Co-Digestion”. Srinakharinwirot University Engineering Journal, vol. 16, no. 2, June 2021, pp. 1-15, https://ph02.tci-thaijo.org/index.php/sej/article/view/243494.