SOULISOMBOON, D., B. SENGPASEUTH, K. SIPHAXAY, S. SISOMPHOU, N. MANIVANH, and A. BINTHAVONE. “Producing Biogas from Difference Mixing Ratio of Local Pig’s Waste to Produce the Methane Gas in Highest Volume: https://doi.Org/10.69692/SUJMRD0802298”. Souphanouvong University Journal Multidisciplinary Research and Development, vol. 8, no. 2, Dec. 2022, pp. 298-02, http://www.su-journal.com/index.php/su/article/view/230.