“BIOGAS PRODUCTION AND CH4 IN VITRO FROM EXCREMENT OF CATTLE, SHEEP, PIGS AND HEN”, Rev. Ecuad. de Investig. Agropecu., vol. 2, no. 3, pp. 5–5, Nov. 2018, Accessed: Dec. 07, 2025. [Online]. Available: https://revistas.uta.edu.ec/index.php/reiagro/article/view/200