R. Piyaphanuwat, S. Samaimai, and V. Limkhuansuwan, “Effects of Nutrient Supplement and Chitosan on Microbial Population Change in Up-Flow-Anaerobic-Sludge-Blanket Reactor during Biogas Production”, J Food Health Bioenv Sci, vol. 14, no. 2, pp. 1–11, Sep. 2023.