Characterization of the physicochemical properties of the excrement of cattle, horses, pigs and chickens for the generation of biogas. Revista Científica Estelí, [S. l.], n. 31, p. 97–108, 2019. DOI: 10.5377/farem.v0i31.8474. Disponível em: https://revistas.unan.edu.ni/index.php/Cientifica/article/view/2199. Acesso em: 9 aug. 2025.