NDYABAWE, Kenneth; KISAALITA, William S. Validity of the Africa-wide Lang factor of 2.63 for estimating small biogas plant installation costs in Uganda. International Journal of Agricultural and Biological Engineering, Beijing, China, v. 7, n. 1, p. 70–76, 2014. Disponível em: https://ijabe.org/index.php/ijabe/article/view/880. Acesso em: 31 mar. 2026.