Tasmaganbetov, Aslan B., Zhumabay Ataniyazov, Zhangul Basshieva, Abu U. Muhammedov, and Anar Yessengeldina. 2020. “World Practice of Using Biogas As Alternative Energy”. International Journal of Energy Economics and Policy 10 (5):348-52. https://mail.econjournals.com/index.php/ijeep/article/view/9805.