ABDULFATAH, S.; MUSA, M.; DAYYABU, I.; ADAMU, I. PRODUCTION OF BIOGAS FROM CO-DIGESTION OF COW DUNG, CHICKEN DROPPING AND COW RUMEN WASTES. FUDMA JOURNAL OF SCIENCES, v. 5, n. 4, p. 413 - 417, 21 Feb. 2022.