Meliyev Muzaffar Saidakbarovich, Axmadjonova Zulxumorxon Nazirjon qizi and Mo’vinova Shoiraxon Iqboljon qizi (2021) “Ecological Features of Biogas Production”, International Journal on Orange Technologies, 3(3), pp. 214-216. doi: 10.31149/ijot.v3i3.1466.