Florendo, P. DC., Sharma-shivappa, R., and Fellner, V. “Cattle Rumen Microorganisms Hydrolysis for Switchgrass Saccharification, Volatile Fatty Acids and Methane Production”. International Journal of Agricultural Technology, vol. 14, no. 1, Jan. 2018, pp. 31-43, https://li04.tci-thaijo.org/index.php/IJAT/article/view/5859.